Subject: Re: [Fot] Final drive (differential) oil

From: Bob Kramer Gmail via Fot <[email-masked]>
Date: Wed, 10 Aug 2022 10:51:13 -0500

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Good point Glen. Welding up the center section makes the soft yellow metal c=
one washers moot.=20

I=E2=80=99ve found EP90 GL4 from Car Quest (available from Advance) as a goo=
d substitute for StaLube GL4, but it overheats and failed us in endurance ra=
cing.  It has always worked in the shorter vintage race, and is cheap enough=
 the drain and refill often.=20

Sent from my iPhone

> On Aug 10, 2022, at 10:03 AM, fubog1 via Fot <[email-masked]> wrote:
>=20
> =EF=BB=BF
> Welded rear gears aren't that fussy about lube, any good hypoid gear oil s=
hould be OK;
> I usually use 80-90 Valvo in them.
> The metal in the sample is a different story, they normally don't "make" a=
ny metal in operation.
> You'll have to remove the cover & get a visual on things, check the lash, m=
esh pattern & preloads best possible in situ.
>=20
> Glen Efinger
>=20
>=20
> -----Original Message-----
> From: Philip Gott via Fot <[email-masked]>
> To: Friends Of Triumph <[email-masked]>
> Sent: Tue, Aug 9, 2022 9:53 pm
> Subject: [Fot] Final drive (differential) oil
>=20
> Amici:
> At the risk of opening Pandora=E2=80=99s box, May I ask what gear oil you w=
ould recommend for the rear end in my TR4A (solid axle)? I am running Mobil 1=
 75-140 and found some metal flakes on my magnetic filler plug after Pitt Ra=
ce. Usually there are some whiskers, but the metal flakes are concerning. Th=
e rear end is a welded diff carrying a relatively new (3 seasons) 4.1 gear s=
et.  I have yet to pull the cover. Backlash seems =E2=80=9Cnormal.=E2=80=9D T=
he rear end was set up by Quantum Mechanics whom I trust.
> What do you all run for oil (brand and viscosity) and what is your experie=
nce?
> Thanks and regards,
> Phil
>=20
> Sent from my iPhone
> _______________________________________________
> [email-masked]
>=20
> http://www.fot-racing.com
>=20
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>=20
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>=20
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>=20
>=20

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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=3D=
utf-8"></head><body dir=3D"auto">Good point Glen. Welding up the center sect=
ion makes the soft yellow metal cone washers moot.&nbsp;<div><br></div><div>=
I=E2=80=99ve found EP90 GL4 from Car Quest (available from Advance) as a goo=
d substitute for StaLube GL4, but it overheats and failed us in endurance ra=
cing. &nbsp;It has always worked in the shorter vintage race, and is cheap e=
nough the drain and refill often.&nbsp;<br><div><br><div dir=3D"ltr">Sent fr=
om my iPhone</div><div dir=3D"ltr"><br><blockquote type=3D"cite">On Aug 10, 2=
022, at 10:03 AM, fubog1 via Fot &lt;[email-masked]&gt; wrote:<br><br></=
blockquote></div><blockquote type=3D"cite"><div dir=3D"ltr">=EF=BB=BF
<div style=3D"color:black;font: 10pt Arial, Helvetica, sans-serif;">
<div> <font size=3D"2">Welded rear gears aren't that fussy about lube, any g=
ood hypoid gear oil should be OK;</font></div>

<div><font size=3D"2">I usually use 80-90 Valvo in them.<br>
</font></div>

<div><font size=3D"2">The metal in the sample is a different story, they nor=
mally don't "make" any metal in operation.</font></div>

<div><font size=3D"2">You'll have to remove the cover &amp; get a visual on t=
hings, check the lash, mesh pattern &amp; preloads best possible in situ.</f=
ont></div>

<div><br>
</div>

<div><font size=3D"2">Glen Efinger</font><br>
</div>

<div> <br>
</div>

<div> <br>
</div>

<div style=3D"font-family:arial,helvetica;font-size:10pt;color:black"><font s=
ize=3D"2">-----Original Message-----<br>
From: Philip Gott via Fot &lt;[email-masked]&gt;<br>
To: Friends Of Triumph &lt;[email-masked]&gt;<br>
Sent: Tue, Aug 9, 2022 9:53 pm<br>
Subject: [Fot] Final drive (differential) oil<br>
<br>

<div dir=3D"ltr">Amici:<br>
</div>

<div dir=3D"ltr">At the risk of opening Pandora=E2=80=99s box, May I ask wha=
t gear oil you would recommend for the rear end in my TR4A (solid axle)? I a=
m running Mobil 1 75-140 and found some metal flakes on my magnetic filler p=
lug after Pitt Race. Usually there are some whiskers, but the metal flakes a=
re concerning. The rear end is a welded diff carrying a relatively new (3 se=
asons) 4.1 gear set.&nbsp; I have yet to pull the cover. Backlash seems =E2=80=
=9Cnormal.=E2=80=9D The rear end was set up by Quantum Mechanics whom I trus=
t.<br>
</div>

<div dir=3D"ltr">What do you all run for oil (brand and viscosity) and what i=
s your experience?<br>
</div>

<div dir=3D"ltr">Thanks and regards,<br>
</div>

<div dir=3D"ltr">Phil<br>
</div>

<div dir=3D"ltr"><br>
</div>

<div dir=3D"ltr">Sent from my iPhone<br>
</div>

<div dir=3D"ltr">_______________________________________________<br>
</div>

<div dir=3D"ltr"><a ymailto=3D"mailto:[email-masked]" href=3D"mailto:fot=
@autox.team.net">[email-masked]</a><br>
</div>

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</div>

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tox.team.net</span><br><span></span><br><span>http://www.fot-racing.com</spa=
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From: fubog1 via Fot <[email-masked]>
Date: Wed, 10 Aug 2022 17:24:30 +0000 (UTC)

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 Bob you bring up another good point as well, there's a big difference betw=
een a 20 minute sprint race & an enduro, the heat is a much bigger consider=
ation...
Glen Efinger
=20
=20
-----Original Message-----
From: Bob Kramer Gmail via Fot <[email-masked]>
To: fubog1 <[email-masked]>
Cc: [email-masked]
Sent: Wed, Aug 10, 2022 11:51 am
Subject: Re: [Fot] Final drive (differential) oil

Good point Glen. Welding up the center section makes the soft yellow metal =
cone washers moot.=C2=A0
I=E2=80=99ve found EP90 GL4 from Car Quest (available from Advance) as a go=
od substitute for StaLube GL4, but it overheats and failed us in endurance =
racing. =C2=A0It has always worked in the shorter vintage race, and is chea=
p enough the drain and refill often.=C2=A0

Sent from my iPhone

=EF=BB=BF Welded rear gears aren't that fussy about lube, any good hypoid g=
ear oil should be OK;I usually use 80-90 Valvo in them.
The metal in the sample is a different story, they normally don't "make" an=
y metal in operation.You'll have to remove the cover & get a visual on thin=
gs, check the lash, mesh pattern & preloads best possible in situ.
Glen Efinger
=20
=20
-----Original Message-----
From: Philip Gott via Fot <[email-masked]>
To: Friends Of Triumph <[email-masked]>
Sent: Tue, Aug 9, 2022 9:53 pm
Subject: [Fot] Final drive (differential) oil

Amici:
At the risk of opening Pandora=E2=80=99s box, May I ask what gear oil you w=
ould recommend for the rear end in my TR4A (solid axle)? I am running Mobil=
 1 75-140 and found some metal flakes on my magnetic filler plug after Pitt=
 Race. Usually there are some whiskers, but the metal flakes are concerning=
. The rear end is a welded diff carrying a relatively new (3 seasons) 4.1 g=
ear set.=C2=A0 I have yet to pull the cover. Backlash seems =E2=80=9Cnormal=
.=E2=80=9D The rear end was set up by Quantum Mechanics whom I trust.
What do you all run for oil (brand and viscosity) and what is your experien=
ce?
Thanks and regards,
Phil

Sent from my iPhone

m

il.com

m

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<div style=3D"color:black;font: 10pt Arial, Helvetica, sans-serif;">
<div> <font size=3D"2">Bob you bring up another good point as well, there's=
 a big difference between a 20 minute sprint race &amp; an enduro, the heat=
 is a much bigger consideration...</font></div>

<div><br>
</div>

<div> <br>
</div>

<div> <br>
</div>

<div style=3D"font-family:arial,helvetica;font-size:10pt;color:black"><font=
 size=3D"2">-----Original Message-----<br>
From: Bob Kramer Gmail via Fot &lt;[email-masked]&gt;<br>
To: fubog1 &lt;[email-masked]&gt;<br>
Cc: [email-masked]<br>
Sent: Wed, Aug 10, 2022 11:51 am<br>
Subject: Re: [Fot] Final drive (differential) oil<br>
<br>

<div id=3D"yiv4865240387">
<div>Good point Glen. Welding up the center section makes the soft yellow m=
etal cone washers moot.&nbsp;
<div><br clear=3D"none"></div>

<div>I=E2=80=99ve found EP90 GL4 from Car Quest (available from Advance) as=
 a good substitute for StaLube GL4, but it overheats and failed us in endur=
ance racing. &nbsp;It has always worked in the shorter vintage race, and is=
 cheap enough the drain and refill often.&nbsp;<br clear=3D"none">
<div><br clear=3D"none">
<div dir=3D"ltr">Sent from my iPhone</div>

<div dir=3D"ltr"><br clear=3D"none"><blockquote type=3D"cite">On Aug 10, 20=
22, at 10:03 AM, fubog1 via Fot &lt;[email-masked]&gt; wrote:<br clear=
=3D"none"><br clear=3D"none"></blockquote></div>
<blockquote type=3D"cite">
<div dir=3D"ltr">=EF=BB=BF

<div id=3D"yiv4865240387yqt05668" class=3D"yiv4865240387yqt4181446518">
<div style=3D"color:black;font:10pt Arial, Helvetica, sans-serif;">

<div> <font size=3D"2">Welded rear gears aren't that fussy about lube, any =
good hypoid gear oil should be OK;</font></div>

<div><font size=3D"2">I usually use 80-90 Valvo in them.<br clear=3D"none">
</font></div>

<div><font size=3D"2">The metal in the sample is a different story, they no=
rmally don't "make" any metal in operation.</font></div>

<div><font size=3D"2">You'll have to remove the cover &amp; get a visual on=
 things, check the lash, mesh pattern &amp; preloads best possible in situ.=
</font></div>

<div><br clear=3D"none">
</div>

<div><font size=3D"2">Glen Efinger</font><br clear=3D"none">
</div>

<div> <br clear=3D"none">
</div>

<div> <br clear=3D"none">
</div>

<div style=3D"font-family:arial, helvetica;font-size:10pt;color:black;"><fo=
nt size=3D"2">-----Original Message-----<br clear=3D"none">
From: Philip Gott via Fot &lt;[email-masked]&gt;<br clear=3D"none">
To: Friends Of Triumph &lt;[email-masked]&gt;<br clear=3D"none">
Sent: Tue, Aug 9, 2022 9:53 pm<br clear=3D"none">
Subject: [Fot] Final drive (differential) oil<br clear=3D"none">
<br clear=3D"none">

</font>
<div dir=3D"ltr">Amici:<br clear=3D"none">
</div>

<div dir=3D"ltr">At the risk of opening Pandora=E2=80=99s box, May I ask wh=
at gear oil you would recommend for the rear end in my TR4A (solid axle)? I=
 am running Mobil 1 75-140 and found some metal flakes on my magnetic fille=
r plug after Pitt Race. Usually there are some whiskers, but the metal flak=
es are concerning. The rear end is a welded diff carrying a relatively new =
(3 seasons) 4.1 gear set.&nbsp; I have yet to pull the cover. Backlash seem=
s =E2=80=9Cnormal.=E2=80=9D The rear end was set up by Quantum Mechanics wh=
om I trust.<br clear=3D"none">
</div>

<div dir=3D"ltr">What do you all run for oil (brand and viscosity) and what=
 is your experience?<br clear=3D"none">
</div>

<div dir=3D"ltr">Thanks and regards,<br clear=3D"none">
</div>

<div dir=3D"ltr">Phil<br clear=3D"none">
</div>

<div dir=3D"ltr"><br clear=3D"none">
</div>

<div dir=3D"ltr">Sent from my iPhone<br clear=3D"none">
</div>

<div dir=3D"ltr">_______________________________________________<br clear=
=3D"none">
</div>

<div dir=3D"ltr"><a rel=3D"nofollow noopener noreferrer" shape=3D"rect" yma=
ilto=3D"mailto:[email-masked]" target=3D"_blank" href=3D"mailto:fot@aut=
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---

From: Alexandre Camoletti via Fot <[email-masked]>
Date: Thu, 11 Aug 2022 10:13:01 +0200

This is a multipart message in MIME format.

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Gents, when heats becomes a problem then you should definitely try the =
Lucas oils. Measure temperatures before and after the change, the =
difference is usually quite big !

=20

De : Fot [mailto:[email-masked]] De la part de fubog1 via =
Fot
Envoy=C3=A9 : mercredi 10 ao=C3=BBt 2022 19:25
=C3=80 : [email-masked]
Cc : [email-masked]
Objet : Re: [Fot] Final drive (differential) oil

=20

Bob you bring up another good point as well, there's a big difference =
between a 20 minute sprint race & an enduro, the heat is a much bigger =
consideration...

=20

Glen Efinger

=20

=20

-----Original Message-----
From: Bob Kramer Gmail via Fot <[email-masked]>
To: fubog1 <[email-masked]>
Cc: [email-masked]
Sent: Wed, Aug 10, 2022 11:51 am
Subject: Re: [Fot] Final drive (differential) oil

Good point Glen. Welding up the center section makes the soft yellow =
metal cone washers moot. =20

=20

I=E2=80=99ve found EP90 GL4 from Car Quest (available from Advance) as a =
good substitute for StaLube GL4, but it overheats and failed us in =
endurance racing.  It has always worked in the shorter vintage race, and =
is cheap enough the drain and refill often.=20

=20

Sent from my iPhone

=EF=BB=BF=20

Welded rear gears aren't that fussy about lube, any good hypoid gear oil =
should be OK;

The metal in the sample is a different story, they normally don't "make" =
any metal in operation.

You'll have to remove the cover & get a visual on things, check the =
lash, mesh pattern & preloads best possible in situ.

=20

Glen Efinger

=20

=20

-----Original Message-----
From: Philip Gott via Fot <[email-masked]>
To: Friends Of Triumph <[email-masked]>
Sent: Tue, Aug 9, 2022 9:53 pm
Subject: [Fot] Final drive (differential) oil

Amici:

At the risk of opening Pandora=E2=80=99s box, May I ask what gear oil =
you would recommend for the rear end in my TR4A (solid axle)? I am =
running Mobil 1 75-140 and found some metal flakes on my magnetic filler =
plug after Pitt Race. Usually there are some whiskers, but the metal =
flakes are concerning. The rear end is a welded diff carrying a =
relatively new (3 seasons) 4.1 gear set.  I have yet to pull the cover. =
Backlash seems =E2=80=9Cnormal.=E2=80=9D The rear end was set up by =
Quantum Mechanics whom I trust.

What do you all run for oil (brand and viscosity) and what is your =
experience?

Thanks and regards,

Phil

=20

Sent from my iPhone

[email-masked]

=20

http://www.fot-racing.com <http://www.fot-racing.com/>=20

=20

Archive: http://autox.team.net/archive  <http://autox.team.net/archive> =
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</o:shapelayout></xml><![endif]--></head><body lang=3DFR-CH link=3Dblue =
vlink=3Dpurple><div class=3DWordSection1><p class=3DMsoNormal><span =
style=3D'font-family:"Garamond","serif";color:#44546A'>Gents, when heats =
becomes a problem then you should definitely try the Lucas oils. Measure =
temperatures before and after the change, the difference is usually =
quite big&nbsp;!<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-family:"Garamond","serif";color:#44546A'><o:p>&nbsp;</o:p><=
/span></p><p class=3DMsoNormal><b><span lang=3DFR =
style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif"'>De&nbsp;:</s=
pan></b><span lang=3DFR =
style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Fot =
[mailto:[email-masked]] <b>De la part de</b> fubog1 via =
Fot<br><b>Envoy=C3=A9&nbsp;:</b> mercredi 10 ao=C3=BBt 2022 =
19:25<br><b>=C3=80&nbsp;:</b> [email-masked]<br><b>Cc&nbsp;:</b> =
[email-masked]<br><b>Objet&nbsp;:</b> Re: [Fot] Final drive =
(differential) oil<o:p></o:p></span></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>B=
ob you bring up another good point as well, there's a big difference =
between a 20 minute sprint race &amp; an enduro, the heat is a much =
bigger consideration...<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><=
o:p>&nbsp;</o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>G=
len Efinger<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><=
o:p>&nbsp;</o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><=
o:p>&nbsp;</o:p></span></p></div><div><p class=3DMsoNormal =
style=3D'margin-bottom:12.0pt'><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>-=
----Original Message-----<br>From: Bob Kramer Gmail via Fot =
&lt;[email-masked]&gt;<br>To: fubog1 &lt;[email-masked]&gt;<br>Cc: =
[email-masked]<br>Sent: Wed, Aug 10, 2022 11:51 am<br>Subject: Re: =
[Fot] Final drive (differential) oil<o:p></o:p></span></p><div =
id=3Dyiv4865240387><div><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>G=
ood point Glen. Welding up the center section makes the soft yellow =
metal cone washers moot.&nbsp; <o:p></o:p></span></p><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><=
o:p>&nbsp;</o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>I=
=E2=80=99ve found EP90 GL4 from Car Quest (available from Advance) as a =
good substitute for StaLube GL4, but it overheats and failed us in =
endurance racing. &nbsp;It has always worked in the shorter vintage =
race, and is cheap enough the drain and refill =
often.&nbsp;<o:p></o:p></span></p><div><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><=
o:p>&nbsp;</o:p></span></p><div><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>S=
ent from my iPhone<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><=
br><br><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-bottom:12.0pt'><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>O=
n Aug 10, 2022, at 10:03 AM, fubog1 via Fot &lt;[email-masked]&gt; =
wrote:<o:p></o:p></span></p></div><blockquote =
style=3D'margin-top:5.0pt;margin-bottom:5.0pt'><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>=EF=
=BB=BF <o:p></o:p></span></p><div =
id=3Dyiv4865240387yqt05668><div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>W=
elded rear gears aren't that fussy about lube, any good hypoid gear oil =
should be OK;<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>I=
 usually use 80-90 Valvo in them.<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>T=
he metal in the sample is a different story, they normally don't =
&quot;make&quot; any metal in =
operation.<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>Y=
ou'll have to remove the cover &amp; get a visual on things, check the =
lash, mesh pattern &amp; preloads best possible in =
situ.<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><=
o:p>&nbsp;</o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>G=
len Efinger<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><=
o:p>&nbsp;</o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><=
o:p>&nbsp;</o:p></span></p></div><div><p class=3DMsoNormal =
style=3D'margin-bottom:12.0pt'><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>-=
----Original Message-----<br>From: Philip Gott via Fot =
&lt;[email-masked]&gt;<br>To: Friends Of Triumph =
&lt;[email-masked]&gt;<br>Sent: Tue, Aug 9, 2022 9:53 pm<br>Subject: =
[Fot] Final drive (differential) oil<o:p></o:p></span></p><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>A=
mici:<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>A=
t the risk of opening Pandora=E2=80=99s box, May I ask what gear oil you =
would recommend for the rear end in my TR4A (solid axle)? I am running =
Mobil 1 75-140 and found some metal flakes on my magnetic filler plug =
after Pitt Race. Usually there are some whiskers, but the metal flakes =
are concerning. The rear end is a welded diff carrying a relatively new =
(3 seasons) 4.1 gear set.&nbsp; I have yet to pull the cover. Backlash =
seems =E2=80=9Cnormal.=E2=80=9D The rear end was set up by Quantum =
Mechanics whom I trust.<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>W=
hat do you all run for oil (brand and viscosity) and what is your =
experience?<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>T=
hanks and regards,<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>P=
hil<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><=
o:p>&nbsp;</o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>S=
ent from my iPhone<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>_=
______________________________________________<o:p></o:p></span></p></div=
><div><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><=
a href=3D"mailto:[email-masked]" =
target=3D"_blank">[email-masked]</a><o:p></o:p></span></p></div><div>=
<p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><=
o:p>&nbsp;</o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><=
a href=3D"http://www.fot-racing.com/" =
target=3D"_blank">http://www.fot-racing.com</a><o:p></o:p></span></p></di=
v><div><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><=
o:p>&nbsp;</o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>D=
onate: <a href=3D"http://www.team.net/donate.html" =
target=3D"_blank">http://www.team.net/donate.html</a><o:p></o:p></span></=
p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>A=
rchive: <a href=3D"http://autox.team.net/archive" =
target=3D"_blank">http://autox.team.net/archive </a><a =
href=3D"http://www.team.net/pipermail/fot" =
target=3D"_blank">http://www.team.net/pipermail/fot</a><o:p></o:p></span>=
</p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>U=
nsubscribe/Manage: <a =
href=3D"http://autox.team.net/mailman/options/fot/[email-masked]" =
target=3D"_blank">http://autox.team.net/mailman/options/fot/[email-masked]=
m</a><o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><=
o:p>&nbsp;</o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><=
o:p>&nbsp;</o:p></span></p></div></div></div></div><p class=3DMsoNormal =
style=3D'margin-bottom:12.0pt'><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>_=
______________________________________________<br>[email-masked]<br><=
br>http://www.fot-racing.com<br><br>Donate: =
http://autox.team.net/archive =
http://www.team.net/pipermail/fot<br>Unsubscribe/Manage: =
http://autox.team.net/mailman/options/fot/[email-masked]<br><br><o:p=
></o:p></span></p></div></blockquote></div></div></div></div><div =
id=3Dyqt65412><p class=3DMsoNormal style=3D'margin-bottom:12.0pt'><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>_=
______________________________________________<br><a =
href=3D"mailto:[email-masked]">[email-masked]</a><br><br><a =
href=3D"http://www.fot-racing.com/" =
target=3D"_blank">http://www.fot-racing.com</a><br><br>Donate: <a =
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m</a><br><br><o:p></o:p></span></p></div></div></div></div></body></html>
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--===============2697049075651527307==--

---

From: Phil Gott via Fot <[email-masked]>
Date: Thu, 11 Aug 2022 14:11:32 +0000 (UTC)

--===============5117453126100777100==
	boundary="----=_Part_203857_1602374735.1660227093006"

------=_Part_203857_1602374735.1660227093006
Content-Transfer-Encoding: quoted-printable

Thank you, everyone!
It would seem that lubes designed for the everyday street-driven car aren't=
 up to the challenge of racing our hyping diffs. =C2=A0I thought the folks =
at Mobil would have done better, but apparently not enough. =C2=A0I've take=
n all your inputs into consideration and going with the Redline Shockproof =
(lightweight) oil. =C2=A0I'm also thinking of bolting on the aluminum cover=
 of the 4A IRS diff to get a little extra capacity and perhaps some better =
cooling, although the added thickness may offset the higher rate of heat tr=
ansfer through the metal. =C2=A0Will do the math.
Your insights are much appreciated.
Regards,
Phil GottRed '65 4A, #114

-----Original Message-----
From: Alexandre Camoletti via Fot <[email-masked]>
To: [email-masked]
Sent: Thu, Aug 11, 2022 4:38 am
Subject: Re: [Fot] Final drive (differential) oil

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Gents, when heats becomes a problem then you should definitely try the Luca=
s oils. Measure temperatures before and after the change, the difference is=
 usually quite big=C2=A0!

 =C2=A0

De=C2=A0: Fot [mailto:[email-masked]] De la part de fubog1 via =
Fot
Envoy=C3=A9=C2=A0: mercredi 10 ao=C3=BBt 2022 19:25
=C3=80=C2=A0: [email-masked]
Cc=C2=A0: [email-masked]
Objet=C2=A0: Re: [Fot] Final drive (differential) oil

 =C2=A0

Bob you bring up another good point as well, there's a big difference betwe=
en a 20 minute sprint race & an enduro, the heat is a much bigger considera=
tion...

 =C2=A0

Glen Efinger

 =C2=A0

 =C2=A0

-----Original Message-----
From: Bob Kramer Gmail via Fot <[email-masked]>
To: fubog1 <[email-masked]>
Cc: [email-masked]
Sent: Wed, Aug 10, 2022 11:51 am
Subject: Re: [Fot] Final drive (differential) oil

Good point Glen. Welding up the center section makes the soft yellow metal =
cone washers moot.=C2=A0=20

 =C2=A0

 =C2=A0

Sent from my iPhone

=EF=BB=BF=20

Welded rear gears aren't that fussy about lube, any good hypoid gear oil sh=
ould be OK;

y metal in operation.

 =C2=A0

Glen Efinger

 =C2=A0

 =C2=A0

-----Original Message-----
From: Philip Gott via Fot <[email-masked]>
To: Friends Of Triumph <[email-masked]>
Sent: Tue, Aug 9, 2022 9:53 pm
Subject: [Fot] Final drive (differential) oil

Amici:

Thanks and regards,

Phil

 =C2=A0

Sent from my iPhone

[email-masked]

 =C2=A0

 =C2=A0

m

 =C2=A0

 =C2=A0

com

------=_Part_203857_1602374735.1660227093006
Content-Transfer-Encoding: quoted-printable

<div style=3D"font-size:10pt;font-family:arial,helvetica,sans-serif;color:b=
lack;"><div style=3D"font-family:arial,helvetica,sans-serif;font-size:10pt;=
color:black;">Thank you, everyone!</div><div style=3D"font-family:arial,hel=
vetica,sans-serif;font-size:10pt;color:black;"><br></div><div style=3D"font=
-family:arial,helvetica,sans-serif;font-size:10pt;color:black;">It would se=
em that lubes designed for the everyday street-driven car aren't up to the =
challenge of racing our hyping diffs. &nbsp;I thought the folks at Mobil wo=
uld have done better, but apparently not enough. &nbsp;I've taken all your =
inputs into consideration and going with the Redline Shockproof (lightweigh=
t) oil. &nbsp;I'm also thinking of bolting on the aluminum cover of the 4A =
IRS diff to get a little extra capacity and perhaps some better cooling, al=
though the added thickness may offset the higher rate of heat transfer thro=
ugh the metal. &nbsp;Will do the math.</div><div style=3D"font-family:arial=
,helvetica,sans-serif;font-size:10pt;color:black;"><br></div><div style=3D"=
font-family:arial,helvetica,sans-serif;font-size:10pt;color:black;">Your in=
sights are much appreciated.</div><div style=3D"font-family:arial,helvetica=
,sans-serif;font-size:10pt;color:black;"><br></div><div style=3D"font-famil=
y:arial,helvetica,sans-serif;font-size:10pt;color:black;">Regards,</div><di=
v style=3D"font-family:arial,helvetica,sans-serif;font-size:10pt;color:blac=
k;"><br></div><div style=3D"font-family:arial,helvetica,sans-serif;font-siz=
e:10pt;color:black;">Phil Gott</div><div style=3D"font-family:arial,helveti=
ca,sans-serif;font-size:10pt;color:black;">Red '65 4A, #114<br><br><br>----=
-Original Message-----<br>From: Alexandre Camoletti via Fot &lt;[email-masked]=
eam.net&gt;<br>To: [email-masked]<br>Sent: Thu, Aug 11, 2022 4:38 am<br=
>Subject: Re: [Fot] Final drive (differential) oil<br><br></div><div id=3D"=
yiv9509520834"><style><!--
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--></style><div><div class=3D"yiv9509520834WordSection1"><p class=3D"yiv950=
9520834MsoNormal"><span style=3D"color:#44546A;">Gents, when heats becomes =
a problem then you should definitely try the Lucas oils. Measure temperatur=
es before and after the change, the difference is usually quite big&nbsp;!<=
/span></p><p class=3D"yiv9509520834MsoNormal"><span style=3D"color:#44546A;=
"> &nbsp;</span></p><p class=3D"yiv9509520834MsoNormal"><b><span lang=3D"FR=
" style=3D"font-size:10.0pt;">De&nbsp;:</span></b><span lang=3D"FR" style=
=3D"font-size:10.0pt;"> Fot [mailto:[email-masked]] <b>De la pa=
rt de</b> fubog1 via Fot<br clear=3D"none"><b>Envoy=C3=A9&nbsp;:</b> mercre=
di 10 ao=C3=BBt 2022 19:25<br clear=3D"none"><b>=C3=80&nbsp;:</b> fot@autox=
.team.net<br clear=3D"none"><b>Cc&nbsp;:</b> [email-masked]<br clear=3D=
"none"><b>Objet&nbsp;:</b> Re: [Fot] Final drive (differential) oil</span><=
/p><p class=3D"yiv9509520834MsoNormal"> &nbsp;</p><div id=3D"yiv9509520834y=
qt75679" class=3D"yiv9509520834yqt0301133184"><div><div><p class=3D"yiv9509=
520834MsoNormal"><span style=3D"font-size:10.0pt;color:black;">Bob you brin=
g up another good point as well, there's a big difference between a 20 minu=
te sprint race &amp; an enduro, the heat is a much bigger consideration...<=
/span></p></div><div><p class=3D"yiv9509520834MsoNormal"><span style=3D"fon=
t-size:10.0pt;color:black;"> &nbsp;</span></p></div><div><p class=3D"yiv950=
9520834MsoNormal"><span style=3D"font-size:10.0pt;color:black;">Glen Efinge=
r</span></p></div><div><p class=3D"yiv9509520834MsoNormal"><span style=3D"f=
ont-size:10.0pt;color:black;"> &nbsp;</span></p></div><div><p class=3D"yiv9=
509520834MsoNormal"><span style=3D"font-size:10.0pt;color:black;"> &nbsp;</=
span></p></div><div><p style=3D"margin-bottom:12.0pt;" class=3D"yiv95095208=
34MsoNormal"><span style=3D"font-size:10.0pt;color:black;">-----Original Me=
ssage-----<br clear=3D"none">From: Bob Kramer Gmail via Fot &lt;[email-masked]=
eam.net&gt;<br clear=3D"none">To: fubog1 &lt;[email-masked]&gt;<br clear=3D=
"none">Cc: [email-masked]<br clear=3D"none">Sent: Wed, Aug 10, 2022 11:=
51 am<br clear=3D"none">Subject: Re: [Fot] Final drive (differential) oil</=
span></p><div id=3D"yiv9509520834"><div><p class=3D"yiv9509520834MsoNormal"=
><span style=3D"font-size:10.0pt;color:black;">Good point Glen. Welding up =
the center section makes the soft yellow metal cone washers moot.&nbsp; </s=
pan></p><div><p class=3D"yiv9509520834MsoNormal"><span style=3D"font-size:1=
0.0pt;color:black;"> &nbsp;</span></p></div><div><p class=3D"yiv9509520834M=
soNormal"><span style=3D"font-size:10.0pt;color:black;">I=E2=80=99ve found =
EP90 GL4 from Car Quest (available from Advance) as a good substitute for S=
taLube GL4, but it overheats and failed us in endurance racing. &nbsp;It ha=
s always worked in the shorter vintage race, and is cheap enough the drain =
and refill often.&nbsp;</span></p><div><p class=3D"yiv9509520834MsoNormal">=
<span style=3D"font-size:10.0pt;color:black;"> &nbsp;</span></p><div><p cla=
ss=3D"yiv9509520834MsoNormal"><span style=3D"font-size:10.0pt;color:black;"=
>Sent from my iPhone</span></p></div><div><p class=3D"yiv9509520834MsoNorma=
l"><span style=3D"font-size:10.0pt;color:black;"><br clear=3D"none"><br cle=
ar=3D"none"></span></p><p style=3D"margin-bottom:12.0pt;" class=3D"yiv95095=
20834MsoNormal"><span style=3D"font-size:10.0pt;color:black;">On Aug 10, 20=
22, at 10:03 AM, fubog1 via Fot &lt;[email-masked]&gt; wrote:</span></p=
></div><blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt;"><div><p =
class=3D"yiv9509520834MsoNormal"><span style=3D"font-size:10.0pt;color:blac=
k;">=EF=BB=BF </span></p><div id=3D"yiv9509520834yqt05668"><div><div><p cla=
ss=3D"yiv9509520834MsoNormal"><span style=3D"font-size:10.0pt;color:black;"=
>Welded rear gears aren't that fussy about lube, any good hypoid gear oil s=
hould be OK;</span></p></div><div><p class=3D"yiv9509520834MsoNormal"><span=
 style=3D"font-size:10.0pt;color:black;">I usually use 80-90 Valvo in them.=
</span></p></div><div><p class=3D"yiv9509520834MsoNormal"><span style=3D"fo=
nt-size:10.0pt;color:black;">The metal in the sample is a different story, =
they normally don't "make" any metal in operation.</span></p></div><div><p =
class=3D"yiv9509520834MsoNormal"><span style=3D"font-size:10.0pt;color:blac=
k;">You'll have to remove the cover &amp; get a visual on things, check the=
 lash, mesh pattern &amp; preloads best possible in situ.</span></p></div><=
div><p class=3D"yiv9509520834MsoNormal"><span style=3D"font-size:10.0pt;col=
or:black;"> &nbsp;</span></p></div><div><p class=3D"yiv9509520834MsoNormal"=
><span style=3D"font-size:10.0pt;color:black;">Glen Efinger</span></p></div=
><div><p class=3D"yiv9509520834MsoNormal"><span style=3D"font-size:10.0pt;c=
olor:black;"> &nbsp;</span></p></div><div><p class=3D"yiv9509520834MsoNorma=
l"><span style=3D"font-size:10.0pt;color:black;"> &nbsp;</span></p></div><d=
iv><p style=3D"margin-bottom:12.0pt;" class=3D"yiv9509520834MsoNormal"><spa=
n style=3D"font-size:10.0pt;color:black;">-----Original Message-----<br cle=
ar=3D"none">From: Philip Gott via Fot &lt;[email-masked]&gt;<br clear=
=3D"none">To: Friends Of Triumph &lt;[email-masked]&gt;<br clear=3D"non=
e">Sent: Tue, Aug 9, 2022 9:53 pm<br clear=3D"none">Subject: [Fot] Final dr=
ive (differential) oil</span></p><div><p class=3D"yiv9509520834MsoNormal"><=
span style=3D"font-size:10.0pt;color:black;">Amici:</span></p></div><div><p=
 class=3D"yiv9509520834MsoNormal"><span style=3D"font-size:10.0pt;color:bla=
ck;">At the risk of opening Pandora=E2=80=99s box, May I ask what gear oil =
you would recommend for the rear end in my TR4A (solid axle)? I am running =
Mobil 1 75-140 and found some metal flakes on my magnetic filler plug after=
 Pitt Race. Usually there are some whiskers, but the metal flakes are conce=
rning. The rear end is a welded diff carrying a relatively new (3 seasons) =
4.1 gear set.&nbsp; I have yet to pull the cover. Backlash seems =E2=80=9Cn=
ormal.=E2=80=9D The rear end was set up by Quantum Mechanics whom I trust.<=
/span></p></div><div><p class=3D"yiv9509520834MsoNormal"><span style=3D"fon=
t-size:10.0pt;color:black;">What do you all run for oil (brand and viscosit=
y) and what is your experience?</span></p></div><div><p class=3D"yiv9509520=
834MsoNormal"><span style=3D"font-size:10.0pt;color:black;">Thanks and rega=
rds,</span></p></div><div><p class=3D"yiv9509520834MsoNormal"><span style=
=3D"font-size:10.0pt;color:black;">Phil</span></p></div><div><p class=3D"yi=
v9509520834MsoNormal"><span style=3D"font-size:10.0pt;color:black;"> &nbsp;=
</span></p></div><div><p class=3D"yiv9509520834MsoNormal"><span style=3D"fo=
nt-size:10.0pt;color:black;">Sent from my iPhone</span></p></div><div><p cl=
ass=3D"yiv9509520834MsoNormal"><span style=3D"font-size:10.0pt;color:black;=
">_______________________________________________</span></p></div><div><p c=
lass=3D"yiv9509520834MsoNormal"><span style=3D"font-size:10.0pt;color:black=
;"><a rel=3D"nofollow noopener noreferrer" shape=3D"rect" ymailto=3D"mailto=
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al"><span style=3D"font-size:10.0pt;color:black;"> &nbsp;</span></p></div><=
div><p class=3D"yiv9509520834MsoNormal"><span style=3D"font-size:10.0pt;col=
or:black;"><a rel=3D"nofollow noopener noreferrer" shape=3D"rect" target=3D=
"_blank" href=3D"http://www.fot-racing.com/">http://www.fot-racing.com</a><=
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------=_Part_203857_1602374735.1660227093006--

--===============5117453126100777100==
Content-Transfer-Encoding: 7bit
Content-Disposition: inline

--===============5117453126100777100==--

---

From: Enquiries Road & Track via Fot <[email-masked]>
Date: Fri, 12 Aug 2022 07:03:40 +1000

--===============3068950239897730311==

--000000000000b68e1905e5fd80e6
Content-Transfer-Encoding: quoted-printable

i offer some comments based on decades of dealing with this issue in lots
of different race cars

to select the correct viscosity, you really need to know the operating
temperature

Adhesive temp indicating labels on the outside of the main diff case are
usually the easiest method. they will give you a good idea of
whats happening inside

typically, the outer case is a few degrees cooler that the circulating oil,
so be cautious here as it is most likely a lot "cooler" then the oil film
between the ring and the pinion at the point of their contact

if you are seeing temps much over 100C on the outer, then the old 90 weight
diff oils are highly unlikely to acceptable

once most 'off-the-shelf" oils get to about 100C, they are starting to
degrade ,  some irrevocably (ie they are stuffed!!)

once you have an idea of temps , start looking at kinematic viscosity of
the oil being suggested. simplistically, its this value that allow the oil
to function as a metal to metal separator and the hotter things get, the
lower the viscosity becomes, and the lower the chance of it keeping metals
apart. the various brands of "race oils" can differ widely in this regard

in most modern rear-drive race cars we are using 140 grade purpose-made
race gear oils, and these have all sorts of fancy additives

microfinishing the ring and pinion gears prior to a diff build, can drop
working temperatures considerably

hope this helps in some way

Terry
Australia

On Fri, Aug 12, 2022 at 12:35 AM Phil Gott via Fot <[email-masked]>
wrote:

> Thank you, everyone!
>
> It would seem that lubes designed for the everyday street-driven car
> aren't up to the challenge of racing our hyping diffs.  I thought the fol=
ks
> at Mobil would have done better, but apparently not enough.  I've taken a=
ll
> your inputs into consideration and going with the Redline Shockproof
> (lightweight) oil.  I'm also thinking of bolting on the aluminum cover of
> the 4A IRS diff to get a little extra capacity and perhaps some better
> cooling, although the added thickness may offset the higher rate of heat
> transfer through the metal.  Will do the math.
>
> Gents, when heats becomes a problem then you should definitely try the
> Lucas oils. Measure temperatures before and after the change, the
> *De :* Fot [mailto:[email-masked]] *De la part de* fubog1 via
> Fot
> *Envoy=C3=A9 :* mercredi 10 ao=C3=BBt 2022 19:25
> *=C3=80 :* [email-masked]
> *Cc :* [email-masked]
> *Objet :* Re: [Fot] Final drive (differential) oil
>
>
>
> Bob you bring up another good point as well, there's a big difference
> between a 20 minute sprint race & an enduro, the heat is a much bigger
> consideration...
>
>
>
> Glen Efinger
>
>
>
>
>
> Good point Glen. Welding up the center section makes the soft yellow meta=
l
> cone washers moot.
good
> substitute for StaLube GL4, but it overheats and failed us in endurance
> racing.  It has always worked in the shorter vintage race, and is cheap
> enough the drain and refill often.
>
>
>
> Sent from my iPhone
>
>
>
> Welded rear gears aren't that fussy about lube, any good hypoid gear oil
> should be OK;
>
> The metal in the sample is a different story, they normally don't "make"
> any metal in operation.
>
> You'll have to remove the cover & get a visual on things, check the lash,
> mesh pattern & preloads best possible in situ.
>
>
>
> Glen Efinger
>
>
>
>
>
> At the risk of opening Pandora=E2=80=99s box, May I ask what gear oil you=
 would
> recommend for the rear end in my TR4A (solid axle)? I am running Mobil 1
> 75-140 and found some metal flakes on my magnetic filler plug after Pitt
> Race. Usually there are some whiskers, but the metal flakes are concernin=
g.
> The rear end is a welded diff carrying a relatively new (3 seasons) 4.1
> gear set.  I have yet to pull the cover. Backlash seems =E2=80=9Cnormal.=
=E2=80=9D The rear
> end was set up by Quantum Mechanics whom I trust.
>
> What do you all run for oil (brand and viscosity) and what is your
> experience?
>
> Thanks and regards,
>
> Phil
>
>
>
> Sent from my iPhone
>
> Unsubscribe/Manage:
> Unsubscribe/Manage:
> Unsubscribe/Manage:
> Unsubscribe/Manage:
> http://autox.team.net/mailman/options/fot/[email-masked]
>
>
> Unsubscribe/Manage <http://www.team.net/pipermail/fotUnsubscribe/Manage>:
> http://autox.team.net/mailman/options/fot/[email-masked]
>
>
>

--000000000000b68e1905e5fd80e6
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">i offer some comments based on decades of dealing with thi=
s issue in lots of different race cars=C2=A0<div><br></div><div>to select=
=C2=A0the correct viscosity, you really=C2=A0need to know the operating tem=
perature</div><div><br></div><div>Adhesive temp indicating labels on the ou=
tside of the main diff case are usually=C2=A0the easiest method. they will =
give you a good idea of whats=C2=A0happening inside</div><div><br></div><di=
v>typically, the outer case is a few degrees cooler that the circulating oi=
l, so be cautious=C2=A0here as it is most likely a lot &quot;cooler&quot; t=
hen the oil film between the ring and the pinion at the point of their cont=
act</div><div><br></div><div>if you are seeing temps much over 100C on the =
outer, then the old 90 weight diff oils are highly unlikely to acceptable</=
div><div><br></div><div>once most &#39;off-the-shelf&quot; oils get to abou=
t 100C, they are starting to degrade ,=C2=A0 some irrevocably (ie they are =
stuffed!!)</div><div><br></div><div>once you have an idea of temps , start =
looking at kinematic=C2=A0viscosity of the oil being suggested. simplistica=
lly, its this value that allow the oil to function as a metal to metal sepa=
rator=C2=A0and the hotter things get, the lower the viscosity becomes, and =
the lower the chance of it keeping metals apart. the various brands of &quo=
t;race oils&quot; can differ widely in this regard</div><div><br></div><div=
>in most=C2=A0modern rear-drive race cars we are using 140 grade purpose-ma=
de race gear oils, and these have all sorts of fancy additives=C2=A0</div><=
div><br></div><div>microfinishing the ring and pinion gears prior to a diff=
 build, can drop working temperatures considerably</div><div><br></div><div=
>hope this helps in some way</div><div><div><div dir=3D"ltr" class=3D"gmail=
_signature" data-smartmail=3D"gmail_signature"><div dir=3D"ltr"><div><div d=
ir=3D"ltr"><div><div dir=3D"ltr"><div><div dir=3D"ltr"><div><div dir=3D"ltr=
"><div><div dir=3D"ltr"><div><br></div><div>Terry</div><div>Australia<br><b=
r></div></div></div></div></div></div></div></div></div></div></div></div><=
/div></div><br></div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" =
class=3D"gmail_attr">On Fri, Aug 12, 2022 at 12:35 AM Phil Gott via Fot &lt=
;<a href=3D"mailto:[email-masked]">[email-masked]</a>&gt; wrote:<br=
></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;=
border-left:1px solid rgb(204,204,204);padding-left:1ex"><div style=3D"font=
-size:10pt;font-family:arial,helvetica,sans-serif;color:black"><div style=
=3D"font-family:arial,helvetica,sans-serif;font-size:10pt;color:black">Than=
k you, everyone!</div><div style=3D"font-family:arial,helvetica,sans-serif;=
font-size:10pt;color:black"><br></div><div style=3D"font-family:arial,helve=
tica,sans-serif;font-size:10pt;color:black">It would seem that lubes design=
ed for the everyday street-driven car aren&#39;t up to the challenge of rac=
ing our hyping diffs.=C2=A0 I thought the folks at Mobil would have done be=
tter, but apparently not enough.=C2=A0 I&#39;ve taken all your inputs into =
consideration and going with the Redline Shockproof (lightweight) oil.=C2=
=A0 I&#39;m also thinking of bolting on the aluminum cover of the 4A IRS di=
ff to get a little extra capacity and perhaps some better cooling, although=
 the added thickness may offset the higher rate of heat transfer through th=
e metal.=C2=A0 Will do the math.</div><div style=3D"font-family:arial,helve=
tica,sans-serif;font-size:10pt;color:black"><br></div><div style=3D"font-fa=
mily:arial,helvetica,sans-serif;font-size:10pt;color:black">Your insights a=
re much appreciated.</div><div style=3D"font-family:arial,helvetica,sans-se=
rif;font-size:10pt;color:black"><br></div><div style=3D"font-family:arial,h=
elvetica,sans-serif;font-size:10pt;color:black">Regards,</div><div style=3D=
"font-family:arial,helvetica,sans-serif;font-size:10pt;color:black"><br></d=
iv><div style=3D"font-family:arial,helvetica,sans-serif;font-size:10pt;colo=
r:black">Phil Gott</div><div style=3D"font-family:arial,helvetica,sans-seri=
f;font-size:10pt;color:black">Red &#39;65 4A, #114<br><br><br>-----Original=
 Message-----<br>From: Alexandre Camoletti via Fot &lt;<a href=3D"mailto:fo=
[email-masked]" target=3D"_blank">[email-masked]</a>&gt;<br>To: <a hr=
ef=3D"mailto:[email-masked]" target=3D"_blank">[email-masked]</a><b=
r>Sent: Thu, Aug 11, 2022 4:38 am<br>Subject: Re: [Fot] Final drive (differ=
ential) oil<br><br></div><div id=3D"gmail-m_-8028308041457436653yiv95095208=
34"><div><div><p><span style=3D"color:rgb(68,84,106)">Gents, when heats bec=
omes a problem then you should definitely try the Lucas oils. Measure tempe=
ratures before and after the change, the difference is usually quite big=C2=
=A0!</span></p><p><span style=3D"color:rgb(68,84,106)"> =C2=A0</span></p><p=
><b><span lang=3D"FR" style=3D"font-size:10pt">De=C2=A0:</span></b><span la=
ng=3D"FR" style=3D"font-size:10pt"> Fot [mailto:<a href=3D"mailto:fot-bounc=
[email-masked]" target=3D"_blank">[email-masked]</a>] <b>De =
la part de</b> fubog1 via Fot<br clear=3D"none"><b>Envoy=C3=A9=C2=A0:</b> m=
ercredi 10 ao=C3=BBt 2022 19:25<br clear=3D"none"><b>=C3=80=C2=A0:</b> <a h=
ref=3D"mailto:[email-masked]" target=3D"_blank">[email-masked]</a><=
br clear=3D"none"><b>Cc=C2=A0:</b> <a href=3D"mailto:[email-masked]" ta=
rget=3D"_blank">[email-masked]</a><br clear=3D"none"><b>Objet=C2=A0:</b=
> Re: [Fot] Final drive (differential) oil</span></p><p> =C2=A0</p><div id=
=3D"gmail-m_-8028308041457436653yiv9509520834yqt75679"><div><div><p><span s=
tyle=3D"font-size:10pt;color:black">Bob you bring up another good point as =
well, there&#39;s a big difference between a 20 minute sprint race &amp; an=
 enduro, the heat is a much bigger consideration...</span></p></div><div><p=
><span style=3D"font-size:10pt;color:black"> =C2=A0</span></p></div><div><p=
><span style=3D"font-size:10pt;color:black">Glen Efinger</span></p></div><d=
iv><p><span style=3D"font-size:10pt;color:black"> =C2=A0</span></p></div><d=
iv><p><span style=3D"font-size:10pt;color:black"> =C2=A0</span></p></div><d=
iv><p style=3D"margin-bottom:12pt"><span style=3D"font-size:10pt;color:blac=
k">-----Original Message-----<br clear=3D"none">From: Bob Kramer Gmail via =
Fot &lt;<a href=3D"mailto:[email-masked]" target=3D"_blank">[email-masked]=
eam.net</a>&gt;<br clear=3D"none">To: fubog1 &lt;<a href=3D"mailto:fubog1@a=
ol.com" target=3D"_blank">[email-masked]</a>&gt;<br clear=3D"none">Cc: <a h=
ref=3D"mailto:[email-masked]" target=3D"_blank">[email-masked]</a><=
br clear=3D"none">Sent: Wed, Aug 10, 2022 11:51 am<br clear=3D"none">Subjec=
t: Re: [Fot] Final drive (differential) oil</span></p><div id=3D"gmail-m_-8=
028308041457436653yiv9509520834"><div><p><span style=3D"font-size:10pt;colo=
r:black">Good point Glen. Welding up the center section makes the soft yell=
ow metal cone washers moot.=C2=A0 </span></p><div><p><span style=3D"font-si=
ze:10pt;color:black"> =C2=A0</span></p></div><div><p><span style=3D"font-si=
ze:10pt;color:black">I=E2=80=99ve found EP90 GL4 from Car Quest (available =
from Advance) as a good substitute for StaLube GL4, but it overheats and fa=
iled us in endurance racing.=C2=A0 It has always worked in the shorter vint=
age race, and is cheap enough the drain and refill often.=C2=A0</span></p><=
div><p><span style=3D"font-size:10pt;color:black"> =C2=A0</span></p><div><p=
><span style=3D"font-size:10pt;color:black">Sent from my iPhone</span></p><=
/div><div><p><span style=3D"font-size:10pt;color:black"><br clear=3D"none">=
<br clear=3D"none"></span></p><p style=3D"margin-bottom:12pt"><span style=
=3D"font-size:10pt;color:black">On Aug 10, 2022, at 10:03 AM, fubog1 via Fo=
t &lt;<a href=3D"mailto:[email-masked]" target=3D"_blank">[email-masked]=
m.net</a>&gt; wrote:</span></p></div><blockquote style=3D"margin-top:5pt;ma=
rgin-bottom:5pt"><div><p><span style=3D"font-size:10pt;color:black">=EF=BB=
=BF </span></p><div id=3D"gmail-m_-8028308041457436653yiv9509520834yqt05668=
"><div><div><p><span style=3D"font-size:10pt;color:black">Welded rear gears=
 aren&#39;t that fussy about lube, any good hypoid gear oil should be OK;</=
span></p></div><div><p><span style=3D"font-size:10pt;color:black">I usually=
 use 80-90 Valvo in them.</span></p></div><div><p><span style=3D"font-size:=
10pt;color:black">The metal in the sample is a different story, they normal=
ly don&#39;t &quot;make&quot; any metal in operation.</span></p></div><div>=
<p><span style=3D"font-size:10pt;color:black">You&#39;ll have to remove the=
 cover &amp; get a visual on things, check the lash, mesh pattern &amp; pre=
loads best possible in situ.</span></p></div><div><p><span style=3D"font-si=
ze:10pt;color:black"> =C2=A0</span></p></div><div><p><span style=3D"font-si=
ze:10pt;color:black">Glen Efinger</span></p></div><div><p><span style=3D"fo=
nt-size:10pt;color:black"> =C2=A0</span></p></div><div><p><span style=3D"fo=
nt-size:10pt;color:black"> =C2=A0</span></p></div><div><p style=3D"margin-b=
ottom:12pt"><span style=3D"font-size:10pt;color:black">-----Original Messag=
e-----<br clear=3D"none">From: Philip Gott via Fot &lt;<a href=3D"mailto:fo=
[email-masked]" target=3D"_blank">[email-masked]</a>&gt;<br clear=3D"=
none">To: Friends Of Triumph &lt;<a href=3D"mailto:[email-masked]" targ=
et=3D"_blank">[email-masked]</a>&gt;<br clear=3D"none">Sent: Tue, Aug 9=
, 2022 9:53 pm<br clear=3D"none">Subject: [Fot] Final drive (differential) =
oil</span></p><div><p><span style=3D"font-size:10pt;color:black">Amici:</sp=
an></p></div><div><p><span style=3D"font-size:10pt;color:black">At the risk=
 of opening Pandora=E2=80=99s box, May I ask what gear oil you would recomm=
end for the rear end in my TR4A (solid axle)? I am running Mobil 1 75-140 a=
nd found some metal flakes on my magnetic filler plug after Pitt Race. Usua=
lly there are some whiskers, but the metal flakes are concerning. The rear =
end is a welded diff carrying a relatively new (3 seasons) 4.1 gear set.=C2=
=A0 I have yet to pull the cover. Backlash seems =E2=80=9Cnormal.=E2=80=9D =
The rear end was set up by Quantum Mechanics whom I trust.</span></p></div>=
<div><p><span style=3D"font-size:10pt;color:black">What do you all run for =
oil (brand and viscosity) and what is your experience?</span></p></div><div=
><p><span style=3D"font-size:10pt;color:black">Thanks and regards,</span></=
p></div><div><p><span style=3D"font-size:10pt;color:black">Phil</span></p><=
/div><div><p><span style=3D"font-size:10pt;color:black"> =C2=A0</span></p><=
/div><div><p><span style=3D"font-size:10pt;color:black">Sent from my iPhone=
</span></p></div><div><p><span style=3D"font-size:10pt;color:black">_______=
________________________________________</span></p></div><div><p><span styl=
e=3D"font-size:10pt;color:black"><a rel=3D"nofollow noopener noreferrer" sh=
ape=3D"rect" href=3D"mailto:[email-masked]" target=3D"_blank">fot@autox=
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lack"> =C2=A0</span></p></div><div><p><span style=3D"font-size:10pt;color:b=
lack"><a rel=3D"nofollow noopener noreferrer" shape=3D"rect" href=3D"http:/=
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></p></div><div><p><span style=3D"font-size:10pt;color:black">Donate: <a re=
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:10pt;color:black">_______________________________________________<br clear=
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iv></blockquote></div></div></div></div><div id=3D"gmail-m_-802830804145743=
6653yiv9509520834yqt65412"><p style=3D"margin-bottom:12pt"><span style=3D"f=
ont-size:10pt;color:black">_______________________________________________<=
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</blockquote></div>

--000000000000b68e1905e5fd80e6--

--===============3068950239897730311==
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--===============3068950239897730311==--

---

From: Philip Gott via Fot <[email-masked]>
Date: Thu, 11 Aug 2022 17:12:27 -0400

--===============7167249282678093338==
Content-Transfer-Encoding: 7bit

--Apple-Mail-9A26F337-391E-4D2D-9A3E-8DB48DA3267B
	charset=utf-8
Content-Transfer-Encoding: quoted-printable

Thanks, Terry:
Good advice.
The situation is not made any easier in my car as the exhaust is only a few i=
nches from the differential!  Makes a good case for having the exhaust exit o=
ut the side!
Phil

Sent from my iPhone

> On Aug 11, 2022, at 5:03 PM, Enquiries Road & Track <enquiries@roadandtrac=
k.net.au> wrote:
>=20
> =EF=BB=BF
> i offer some comments based on decades of dealing with this issue in lots o=
f different race cars=20
>=20
> to select the correct viscosity, you really need to know the operating tem=
perature
>=20
> Adhesive temp indicating labels on the outside of the main diff case are u=
sually the easiest method. they will give you a good idea of whats happening=
 inside
>=20
> typically, the outer case is a few degrees cooler that the circulating oil=
, so be cautious here as it is most likely a lot "cooler" then the oil film b=
etween the ring and the pinion at the point of their contact
>=20
> if you are seeing temps much over 100C on the outer, then the old 90 weigh=
t diff oils are highly unlikely to acceptable
>=20
> once most 'off-the-shelf" oils get to about 100C, they are starting to deg=
rade ,  some irrevocably (ie they are stuffed!!)
>=20
> once you have an idea of temps , start looking at kinematic viscosity of t=
he oil being suggested. simplistically, its this value that allow the oil to=
 function as a metal to metal separator and the hotter things get, the lower=
 the viscosity becomes, and the lower the chance of it keeping metals apart.=
 the various brands of "race oils" can differ widely in this regard
>=20
> in most modern rear-drive race cars we are using 140 grade purpose-made ra=
ce gear oils, and these have all sorts of fancy additives=20
>=20
> microfinishing the ring and pinion gears prior to a diff build, can drop w=
orking temperatures considerably
>> On Fri, Aug 12, 2022 at 12:35 AM Phil Gott via Fot <[email-masked]> w=
rote:
>> Thank you, everyone!
>>=20
>> It would seem that lubes designed for the everyday street-driven car aren=
't up to the challenge of racing our hyping diffs.  I thought the folks at M=
obil would have done better, but apparently not enough.  I've taken all your=
 inputs into consideration and going with the Redline Shockproof (lightweigh=
t) oil.  I'm also thinking of bolting on the aluminum cover of the 4A IRS di=
ff to get a little extra capacity and perhaps some better cooling, although t=
he added thickness may offset the higher rate of heat transfer through the m=
etal.  Will do the math.
>> Gents, when heats becomes a problem then you should definitely try the Lu=
cas oils. Measure temperatures before and after the change, the difference i=
s usually quite big !
>>=20
>> =20
>>=20
>> De : Fot [mailto:[email-masked]] De la part de fubog1 via Fot=

>> Bob you bring up another good point as well, there's a big difference bet=
ween a 20 minute sprint race & an enduro, the heat is a much bigger consider=
ation...
>> Good point Glen. Welding up the center section makes the soft yellow meta=
l cone washers moot.=20
>>=20
>> =20
>>=20
>> I=E2=80=99ve found EP90 GL4 from Car Quest (available from Advance) as a g=
ood substitute for StaLube GL4, but it overheats and failed us in endurance r=
acing.  It has always worked in the shorter vintage race, and is cheap enoug=
h the drain and refill often.=20
hould be OK;
ny metal in operation.
>>=20
>> You'll have to remove the cover & get a visual on things, check the lash,=
>> At the risk of opening Pandora=E2=80=99s box, May I ask what gear oil you=
 would recommend for the rear end in my TR4A (solid axle)? I am running Mobi=
l 1 75-140 and found some metal flakes on my magnetic filler plug after Pitt=
 Race. Usually there are some whiskers, but the metal flakes are concerning.=
 The rear end is a welded diff carrying a relatively new (3 seasons) 4.1 gea=
r set.  I have yet to pull the cover. Backlash seems =E2=80=9Cnormal.=E2=80=9D=
 The rear end was set up by Quantum Mechanics whom I trust.
>>=20
>> What do you all run for oil (brand and viscosity) and what is your experi=
ence?
>> Unsubscribe/Manage: http://autox.team.net/mailman/options/fot/fubog1@aol.=
com
>> Unsubscribe/Manage: http://autox.team.net/mailman/options/fot/rkramer56@g=
mail.com
>> Unsubscribe/Manage: http://autox.team.net/mailman/options/fot/fubog1@aol.=
com
>> Unsubscribe/Manage: http://autox.team.net/mailman/options/fot/vfracing@ao=
l.com
>> Unsubscribe/Manage: http://autox.team.net/mailman/options/fot/enquiries@r=
oadandtrack.net.au

--Apple-Mail-9A26F337-391E-4D2D-9A3E-8DB48DA3267B
	charset=utf-8
Content-Transfer-Encoding: quoted-printable

<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=3D=
utf-8"></head><body dir=3D"auto">Thanks, Terry:<div>Good advice.</div><div>T=
he situation is not made any easier in my car as the exhaust is only a few i=
nches from the differential! &nbsp;Makes a good case for having the exhaust e=
xit out the side!</div><div>Phil</div><div><br><div dir=3D"ltr">Sent from my=
 iPhone</div><div dir=3D"ltr"><br><blockquote type=3D"cite">On Aug 11, 2022,=
 at 5:03 PM, Enquiries Road &amp; Track &lt;[email-masked]&gt=
; wrote:<br><br></blockquote></div><blockquote type=3D"cite"><div dir=3D"ltr=
">=EF=BB=BF<div dir=3D"ltr">i offer some comments based on decades of dealin=
g with this issue in lots of different race cars&nbsp;<div><br></div><div>to=
 select&nbsp;the correct viscosity, you really&nbsp;need to know the operati=
ng temperature</div><div><br></div><div>Adhesive temp indicating labels on t=
he outside of the main diff case are usually&nbsp;the easiest method. they w=
ill give you a good idea of whats&nbsp;happening inside</div><div><br></div>=
<div>typically, the outer case is a few degrees cooler that the circulating o=
il, so be cautious&nbsp;here as it is most likely a lot "cooler" then the oi=
l film between the ring and the pinion at the point of their contact</div><d=
iv><br></div><div>if you are seeing temps much over 100C on the outer, then t=
he old 90 weight diff oils are highly unlikely to acceptable</div><div><br><=
/div><div>once most 'off-the-shelf" oils get to about 100C, they are startin=
g to degrade ,&nbsp; some irrevocably (ie they are stuffed!!)</div><div><br>=
</div><div>once you have an idea of temps , start looking at kinematic&nbsp;=
viscosity of the oil being suggested. simplistically, its this value that al=
low the oil to function as a metal to metal separator&nbsp;and the hotter th=
ings get, the lower the viscosity becomes, and the lower the chance of it ke=
eping metals apart. the various brands of "race oils" can differ widely in t=
his regard</div><div><br></div><div>in most&nbsp;modern rear-drive race cars=
 we are using 140 grade purpose-made race gear oils, and these have all sort=
s of fancy additives&nbsp;</div><div><br></div><div>microfinishing the ring a=
nd pinion gears prior to a diff build, can drop working temperatures conside=
rably</div><div><br></div><div>hope this helps in some way</div><div><div><d=
iv dir=3D"ltr" class=3D"gmail_signature" data-smartmail=3D"gmail_signature">=
<div dir=3D"ltr"><div><div dir=3D"ltr"><div><div dir=3D"ltr"><div><div dir=3D=
"ltr"><div><div dir=3D"ltr"><div><div dir=3D"ltr"><div><br></div><div>Terry<=
/div><div>Australia<br><br></div></div></div></div></div></div></div></div><=
/div></div></div></div></div></div><br></div></div><br><div class=3D"gmail_q=
uote"><div dir=3D"ltr" class=3D"gmail_attr">On Fri, Aug 12, 2022 at 12:35 AM=
 Phil Gott via Fot &lt;<a href=3D"mailto:[email-masked]">[email-masked].=
net</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margi=
n:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"=
><div style=3D"font-size:10pt;font-family:arial,helvetica,sans-serif;color:b=
lack"><div style=3D"font-family:arial,helvetica,sans-serif;font-size:10pt;co=
lor:black">Thank you, everyone!</div><div style=3D"font-family:arial,helveti=
ca,sans-serif;font-size:10pt;color:black"><br></div><div style=3D"font-famil=
y:arial,helvetica,sans-serif;font-size:10pt;color:black">It would seem that l=
ubes designed for the everyday street-driven car aren't up to the challenge o=
f racing our hyping diffs.&nbsp; I thought the folks at Mobil would have don=
e better, but apparently not enough.&nbsp; I've taken all your inputs into c=
onsideration and going with the Redline Shockproof (lightweight) oil.&nbsp; I=
'm also thinking of bolting on the aluminum cover of the 4A IRS diff to get a=
 little extra capacity and perhaps some better cooling, although the added t=
hickness may offset the higher rate of heat transfer through the metal.&nbsp=
; Will do the math.</div><div style=3D"font-family:arial,helvetica,sans-seri=
f;font-size:10pt;color:black"><br></div><div style=3D"font-family:arial,helv=
etica,sans-serif;font-size:10pt;color:black">Your insights are much apprecia=
ted.</div><div style=3D"font-family:arial,helvetica,sans-serif;font-size:10p=
t;color:black"><br></div><div style=3D"font-family:arial,helvetica,sans-seri=
f;font-size:10pt;color:black">Regards,</div><div style=3D"font-family:arial,=
helvetica,sans-serif;font-size:10pt;color:black"><br></div><div style=3D"fon=
t-family:arial,helvetica,sans-serif;font-size:10pt;color:black">Phil Gott</d=
iv><div style=3D"font-family:arial,helvetica,sans-serif;font-size:10pt;color=
:black">Red '65 4A, #114<br><br><br>-----Original Message-----<br>From: Alex=
andre Camoletti via Fot &lt;<a href=3D"mailto:[email-masked]" target=3D"=
_blank">[email-masked]</a>&gt;<br>To: <a href=3D"mailto:[email-masked]=
et" target=3D"_blank">[email-masked]</a><br>Sent: Thu, Aug 11, 2022 4:38=
 am<br>Subject: Re: [Fot] Final drive (differential) oil<br><br></div><div i=
d=3D"gmail-m_-8028308041457436653yiv9509520834"><div><div><p><span style=3D"=
color:rgb(68,84,106)">Gents, when heats becomes a problem then you should de=
finitely try the Lucas oils. Measure temperatures before and after the chang=
e, the difference is usually quite big&nbsp;!</span></p><p><span style=3D"co=
lor:rgb(68,84,106)"> &nbsp;</span></p><p><b><span lang=3D"FR" style=3D"font-=
size:10pt">De&nbsp;:</span></b><span lang=3D"FR" style=3D"font-size:10pt"> Fo=
t [mailto:<a href=3D"mailto:[email-masked]" target=3D"_blank">fo=
[email-masked]</a>] <b>De la part de</b> fubog1 via Fot<br clear=3D=
"none"><b>Envoy=C3=A9&nbsp;:</b> mercredi 10 ao=C3=BBt 2022 19:25<br clear=3D=
"none"><b>=C3=80&nbsp;:</b> <a href=3D"mailto:[email-masked]" target=3D"=
_blank">[email-masked]</a><br clear=3D"none"><b>Cc&nbsp;:</b> <a href=3D=
"mailto:[email-masked]" target=3D"_blank">[email-masked]</a><br clea=
r=3D"none"><b>Objet&nbsp;:</b> Re: [Fot] Final drive (differential) oil</spa=
n></p><p> &nbsp;</p><div id=3D"gmail-m_-8028308041457436653yiv9509520834yqt7=
5679"><div><div><p><span style=3D"font-size:10pt;color:black">Bob you bring u=
p another good point as well, there's a big difference between a 20 minute s=
print race &amp; an enduro, the heat is a much bigger consideration...</span=
></p></div><div><p><span style=3D"font-size:10pt;color:black"> &nbsp;</span>=
</p></div><div><p><span style=3D"font-size:10pt;color:black">Glen Efinger</s=
pan></p></div><div><p><span style=3D"font-size:10pt;color:black"> &nbsp;</sp=
an></p></div><div><p><span style=3D"font-size:10pt;color:black"> &nbsp;</spa=
n></p></div><div><p style=3D"margin-bottom:12pt"><span style=3D"font-size:10=
pt;color:black">-----Original Message-----<br clear=3D"none">From: Bob Krame=
r Gmail via Fot &lt;<a href=3D"mailto:[email-masked]" target=3D"_blank">=
[email-masked]</a>&gt;<br clear=3D"none">To: fubog1 &lt;<a href=3D"mailt=
o:[email-masked]" target=3D"_blank">[email-masked]</a>&gt;<br clear=3D"none"=
>Cc: <a href=3D"mailto:[email-masked]" target=3D"_blank">[email-masked].=
net</a><br clear=3D"none">Sent: Wed, Aug 10, 2022 11:51 am<br clear=3D"none"=
>Subject: Re: [Fot] Final drive (differential) oil</span></p><div id=3D"gmai=
l-m_-8028308041457436653yiv9509520834"><div><p><span style=3D"font-size:10pt=
;color:black">Good point Glen. Welding up the center section makes the soft y=
ellow metal cone washers moot.&nbsp; </span></p><div><p><span style=3D"font-=
size:10pt;color:black"> &nbsp;</span></p></div><div><p><span style=3D"font-s=
ize:10pt;color:black">I=E2=80=99ve found EP90 GL4 from Car Quest (available f=
rom Advance) as a good substitute for StaLube GL4, but it overheats and fail=
ed us in endurance racing.&nbsp; It has always worked in the shorter vintage=
 race, and is cheap enough the drain and refill often.&nbsp;</span></p><div>=
<p><span style=3D"font-size:10pt;color:black"> &nbsp;</span></p><div><p><spa=
n style=3D"font-size:10pt;color:black">Sent from my iPhone</span></p></div><=
div><p><span style=3D"font-size:10pt;color:black"><br clear=3D"none"><br cle=
ar=3D"none"></span></p><p style=3D"margin-bottom:12pt"><span style=3D"font-s=
ize:10pt;color:black">On Aug 10, 2022, at 10:03 AM, fubog1 via Fot &lt;<a hr=
ef=3D"mailto:[email-masked]" target=3D"_blank">[email-masked]</a>&gt=
; wrote:</span></p></div><blockquote style=3D"margin-top:5pt;margin-bottom:5=
pt"><div><p><span style=3D"font-size:10pt;color:black">=EF=BB=BF </span></p>=
<div id=3D"gmail-m_-8028308041457436653yiv9509520834yqt05668"><div><div><p><=
span style=3D"font-size:10pt;color:black">Welded rear gears aren't that fuss=
y about lube, any good hypoid gear oil should be OK;</span></p></div><div><p=
><span style=3D"font-size:10pt;color:black">I usually use 80-90 Valvo in the=
m.</span></p></div><div><p><span style=3D"font-size:10pt;color:black">The me=
tal in the sample is a different story, they normally don't "make" any metal=
 in operation.</span></p></div><div><p><span style=3D"font-size:10pt;color:b=
lack">You'll have to remove the cover &amp; get a visual on things, check th=
e lash, mesh pattern &amp; preloads best possible in situ.</span></p></div><=
div><p><span style=3D"font-size:10pt;color:black"> &nbsp;</span></p></div><d=
iv><p><span style=3D"font-size:10pt;color:black">Glen Efinger</span></p></di=
v><div><p><span style=3D"font-size:10pt;color:black"> &nbsp;</span></p></div=
><div><p><span style=3D"font-size:10pt;color:black"> &nbsp;</span></p></div>=
<div><p style=3D"margin-bottom:12pt"><span style=3D"font-size:10pt;color:bla=
ck">-----Original Message-----<br clear=3D"none">From: Philip Gott via Fot &=
lt;<a href=3D"mailto:[email-masked]" target=3D"_blank">[email-masked]=
t</a>&gt;<br clear=3D"none">To: Friends Of Triumph &lt;<a href=3D"mailto:fot=
@autox.team.net" target=3D"_blank">[email-masked]</a>&gt;<br clear=3D"no=
ne">Sent: Tue, Aug 9, 2022 9:53 pm<br clear=3D"none">Subject: [Fot] Final dr=
ive (differential) oil</span></p><div><p><span style=3D"font-size:10pt;color=
:black">Amici:</span></p></div><div><p><span style=3D"font-size:10pt;color:b=
lack">At the risk of opening Pandora=E2=80=99s box, May I ask what gear oil y=
ou would recommend for the rear end in my TR4A (solid axle)? I am running Mo=
bil 1 75-140 and found some metal flakes on my magnetic filler plug after Pi=
tt Race. Usually there are some whiskers, but the metal flakes are concernin=
g. The rear end is a welded diff carrying a relatively new (3 seasons) 4.1 g=
ear set.&nbsp; I have yet to pull the cover. Backlash seems =E2=80=9Cnormal.=
=E2=80=9D The rear end was set up by Quantum Mechanics whom I trust.</span><=
/p></div><div><p><span style=3D"font-size:10pt;color:black">What do you all r=
un for oil (brand and viscosity) and what is your experience?</span></p></di=
v><div><p><span style=3D"font-size:10pt;color:black">Thanks and regards,</sp=
an></p></div><div><p><span style=3D"font-size:10pt;color:black">Phil</span><=
/p></div><div><p><span style=3D"font-size:10pt;color:black"> &nbsp;</span></=
p></div><div><p><span style=3D"font-size:10pt;color:black">Sent from my iPho=
ne</span></p></div><div><p><span style=3D"font-size:10pt;color:black">______=
_________________________________________</span></p></div><div><p><span styl=
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--===============7167249282678093338==--

---

From: Enquiries Road & Track via Fot <[email-masked]>
Date: Fri, 12 Aug 2022 07:26:12 +1000

--===============3732953082773531030==

--000000000000496bb205e5fdd168
Content-Transfer-Encoding: quoted-printable

Agreed!

thats a common "fault" on rear drive cars. we typically get the exh pipe
thermal coated or wrap it in that region

On Fri, Aug 12, 2022 at 7:12 AM Philip Gott <[email-masked]> wrote:

> Thanks, Terry:
> Good advice.
> The situation is not made any easier in my car as the exhaust is only a
> few inches from the differential!  Makes a good case for having the exhau=
st
> exit out the side!
> Phil
>
> Sent from my iPhone
>
> On Aug 11, 2022, at 5:03 PM, Enquiries Road & Track <
> [email-masked]> wrote:
>
> =EF=BB=BF
> typically, the outer case is a few degrees cooler that the circulating
> oil, so be cautious here as it is most likely a lot "cooler" then the oil
> film between the ring and the pinion at the point of their contact
>
> if you are seeing temps much over 100C on the outer, then the old 90
> weight diff oils are highly unlikely to acceptable
>
> the oil being suggested. simplistically, its this value that allow the oi=
l
> lower the viscosity becomes, and the lower the chance of it keeping metal=
s
>> aren't up to the challenge of racing our hyping diffs.  I thought the fo=
lks
>> at Mobil would have done better, but apparently not enough.  I've taken =
all
>> (lightweight) oil.  I'm also thinking of bolting on the aluminum cover o=
f
>> *De :* Fot [mailto:[email-masked]] *De la part de* fubog1
>> via Fot
>> Good point Glen. Welding up the center section makes the soft yellow
>> metal cone washers moot.
>>
>>
>>
>> I=E2=80=99ve found EP90 GL4 from Car Quest (available from Advance) as a=
 good
>> You'll have to remove the cover & get a visual on things, check the lash=
,
>> At the risk of opening Pandora=E2=80=99s box, May I ask what gear oil yo=
u would
>> Race. Usually there are some whiskers, but the metal flakes are concerni=
ng.
=E2=80=9D The rear
>> Unsubscribe/Manage <http://www.team.net/pipermail/fotUnsubscribe/Manage>=
>> http://autox.team.net/mailman/options/fot/[email-masked]

--000000000000496bb205e5fdd168
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Agreed!=C2=A0<div><br></div><div>thats a common &quot;faul=
t&quot; on rear drive cars. we typically get the exh pipe thermal coated or=
 wrap it in that region</div><div><br></div><div><div><div dir=3D"ltr" clas=
s=3D"gmail_signature" data-smartmail=3D"gmail_signature"><div dir=3D"ltr"><=
div><div dir=3D"ltr"><div><div dir=3D"ltr"><div><div dir=3D"ltr"><div><div =
dir=3D"ltr"><div><div dir=3D"ltr"><div><br></div></div></div></div></div></=
div></div></div></div></div></div></div></div></div></div></div><br><div cl=
ass=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Fri, Aug 12, 2=
022 at 7:12 AM Philip Gott &lt;<a href=3D"mailto:[email-masked]">vfracing=
@aol.com</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D=
"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-le=
ft:1ex"><div dir=3D"auto">Thanks, Terry:<div>Good advice.</div><div>The sit=
uation is not made any easier in my car as the exhaust is only a few inches=
 from the differential!=C2=A0 Makes a good case for having the exhaust exit=
 out the side!</div><div>Phil</div><div><br><div dir=3D"ltr">Sent from my i=
Phone</div><div dir=3D"ltr"><br><blockquote type=3D"cite">On Aug 11, 2022, =
at 5:03 PM, Enquiries Road &amp; Track &lt;<a href=3D"mailto:enquiries@road=
andtrack.net.au" target=3D"_blank">[email-masked]</a>&gt; wr=
ote:<br><br></blockquote></div><blockquote type=3D"cite"><div dir=3D"ltr">=
=EF=BB=BF<div dir=3D"ltr">i offer some comments based on decades of dealing=
 with this issue in lots of different race cars=C2=A0<div><br></div><div>to=
 select=C2=A0the correct viscosity, you really=C2=A0need to know the operat=
ing temperature</div><div><br></div><div>Adhesive temp indicating labels on=
 the outside of the main diff case are usually=C2=A0the easiest method. the=
y will give you a good idea of whats=C2=A0happening inside</div><div><br></=
div><div>typically, the outer case is a few degrees cooler that the circula=
ting oil, so be cautious=C2=A0here as it is most likely a lot &quot;cooler&=
quot; then the oil film between the ring and the pinion at the point of the=
ir contact</div><div><br></div><div>if you are seeing temps much over 100C =
on the outer, then the old 90 weight diff oils are highly unlikely to accep=
table</div><div><br></div><div>once most &#39;off-the-shelf&quot; oils get =
to about 100C, they are starting to degrade ,=C2=A0 some irrevocably (ie th=
ey are stuffed!!)</div><div><br></div><div>once you have an idea of temps ,=
 start looking at kinematic=C2=A0viscosity of the oil being suggested. simp=
listically, its this value that allow the oil to function as a metal to met=
al separator=C2=A0and the hotter things get, the lower the viscosity become=
s, and the lower the chance of it keeping metals apart. the various brands =
of &quot;race oils&quot; can differ widely in this regard</div><div><br></d=
iv><div>in most=C2=A0modern rear-drive race cars we are using 140 grade pur=
pose-made race gear oils, and these have all sorts of fancy additives=C2=A0=
</div><div><br></div><div>microfinishing the ring and pinion gears prior to=
 a diff build, can drop working temperatures considerably</div><div><br></d=
iv><div>hope this helps in some way</div><div><div><div dir=3D"ltr"><div di=
r=3D"ltr"><div><div dir=3D"ltr"><div><div dir=3D"ltr"><div><div dir=3D"ltr"=
><div><div dir=3D"ltr"><div><div dir=3D"ltr"><div><br></div><div>Terry</div=
><div>Australia<br><br></div></div></div></div></div></div></div></div></di=
v></div></div></div></div></div><br></div></div><br><div class=3D"gmail_quo=
te"><div dir=3D"ltr" class=3D"gmail_attr">On Fri, Aug 12, 2022 at 12:35 AM =
Phil Gott via Fot &lt;<a href=3D"mailto:[email-masked]" target=3D"_blan=
k">[email-masked]</a>&gt; wrote:<br></div><blockquote class=3D"gmail_qu=
ote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,20=
4);padding-left:1ex"><div style=3D"font-size:10pt;font-family:arial,helveti=
ca,sans-serif;color:black"><div style=3D"font-family:arial,helvetica,sans-s=
erif;font-size:10pt;color:black">Thank you, everyone!</div><div style=3D"fo=
nt-family:arial,helvetica,sans-serif;font-size:10pt;color:black"><br></div>=
<div style=3D"font-family:arial,helvetica,sans-serif;font-size:10pt;color:b=
lack">It would seem that lubes designed for the everyday street-driven car =
aren&#39;t up to the challenge of racing our hyping diffs.=C2=A0 I thought =
the folks at Mobil would have done better, but apparently not enough.=C2=A0=
 I&#39;ve taken all your inputs into consideration and going with the Redli=
ne Shockproof (lightweight) oil.=C2=A0 I&#39;m also thinking of bolting on =
the aluminum cover of the 4A IRS diff to get a little extra capacity and pe=
rhaps some better cooling, although the added thickness may offset the high=
er rate of heat transfer through the metal.=C2=A0 Will do the math.</div><d=
iv style=3D"font-family:arial,helvetica,sans-serif;font-size:10pt;color:bla=
ck"><br></div><div style=3D"font-family:arial,helvetica,sans-serif;font-siz=
e:10pt;color:black">Your insights are much appreciated.</div><div style=3D"=
font-family:arial,helvetica,sans-serif;font-size:10pt;color:black"><br></di=
v><div style=3D"font-family:arial,helvetica,sans-serif;font-size:10pt;color=
:black">Regards,</div><div style=3D"font-family:arial,helvetica,sans-serif;=
font-size:10pt;color:black"><br></div><div style=3D"font-family:arial,helve=
tica,sans-serif;font-size:10pt;color:black">Phil Gott</div><div style=3D"fo=
nt-family:arial,helvetica,sans-serif;font-size:10pt;color:black">Red &#39;6=
5 4A, #114<br><br><br>-----Original Message-----<br>From: Alexandre Camolet=
ti via Fot &lt;<a href=3D"mailto:[email-masked]" target=3D"_blank">fot@=
autox.team.net</a>&gt;<br>To: <a href=3D"mailto:[email-masked]" target=
=3D"_blank">[email-masked]</a><br>Sent: Thu, Aug 11, 2022 4:38 am<br>Su=
bject: Re: [Fot] Final drive (differential) oil<br><br></div><div id=3D"gma=
il-m_-412229061168828563gmail-m_-8028308041457436653yiv9509520834"><div><di=
v><p><span style=3D"color:rgb(68,84,106)">Gents, when heats becomes a probl=
em then you should definitely try the Lucas oils. Measure temperatures befo=
re and after the change, the difference is usually quite big=C2=A0!</span><=
/p><p><span style=3D"color:rgb(68,84,106)"> =C2=A0</span></p><p><b><span la=
ng=3D"FR" style=3D"font-size:10pt">De=C2=A0:</span></b><span lang=3D"FR" st=
yle=3D"font-size:10pt"> Fot [mailto:<a href=3D"mailto:[email-masked]=
m.net" target=3D"_blank">[email-masked]</a>] <b>De la part de</=
b> fubog1 via Fot<br clear=3D"none"><b>Envoy=C3=A9=C2=A0:</b> mercredi 10 a=
o=C3=BBt 2022 19:25<br clear=3D"none"><b>=C3=80=C2=A0:</b> <a href=3D"mailt=
o:[email-masked]" target=3D"_blank">[email-masked]</a><br clear=3D"=
none"><b>Cc=C2=A0:</b> <a href=3D"mailto:[email-masked]" target=3D"_bla=
nk">[email-masked]</a><br clear=3D"none"><b>Objet=C2=A0:</b> Re: [Fot] =
Final drive (differential) oil</span></p><p> =C2=A0</p><div id=3D"gmail-m_-=
412229061168828563gmail-m_-8028308041457436653yiv9509520834yqt75679"><div><=
div><p><span style=3D"font-size:10pt;color:black">Bob you bring up another =
good point as well, there&#39;s a big difference between a 20 minute sprint=
 race &amp; an enduro, the heat is a much bigger consideration...</span></p=
></div><div><p><span style=3D"font-size:10pt;color:black"> =C2=A0</span></p=
></div><div><p><span style=3D"font-size:10pt;color:black">Glen Efinger</spa=
n></p></div><div><p><span style=3D"font-size:10pt;color:black"> =C2=A0</spa=
n></p></div><div><p><span style=3D"font-size:10pt;color:black"> =C2=A0</spa=
n></p></div><div><p style=3D"margin-bottom:12pt"><span style=3D"font-size:1=
0pt;color:black">-----Original Message-----<br clear=3D"none">From: Bob Kra=
mer Gmail via Fot &lt;<a href=3D"mailto:[email-masked]" target=3D"_blan=
k">[email-masked]</a>&gt;<br clear=3D"none">To: fubog1 &lt;<a href=3D"m=
ailto:[email-masked]" target=3D"_blank">[email-masked]</a>&gt;<br clear=3D"=
none">Cc: <a href=3D"mailto:[email-masked]" target=3D"_blank">fot@autox=
.team.net</a><br clear=3D"none">Sent: Wed, Aug 10, 2022 11:51 am<br clear=
=3D"none">Subject: Re: [Fot] Final drive (differential) oil</span></p><div =
id=3D"gmail-m_-412229061168828563gmail-m_-8028308041457436653yiv9509520834"=
><div><p><span style=3D"font-size:10pt;color:black">Good point Glen. Weldin=
g up the center section makes the soft yellow metal cone washers moot.=C2=
=A0 </span></p><div><p><span style=3D"font-size:10pt;color:black"> =C2=A0</=
span></p></div><div><p><span style=3D"font-size:10pt;color:black">I=E2=80=
=99ve found EP90 GL4 from Car Quest (available from Advance) as a good subs=
titute for StaLube GL4, but it overheats and failed us in endurance racing.=
=C2=A0 It has always worked in the shorter vintage race, and is cheap enoug=
h the drain and refill often.=C2=A0</span></p><div><p><span style=3D"font-s=
ize:10pt;color:black"> =C2=A0</span></p><div><p><span style=3D"font-size:10=
pt;color:black">Sent from my iPhone</span></p></div><div><p><span style=3D"=
font-size:10pt;color:black"><br clear=3D"none"><br clear=3D"none"></span></=
p><p style=3D"margin-bottom:12pt"><span style=3D"font-size:10pt;color:black=
">On Aug 10, 2022, at 10:03 AM, fubog1 via Fot &lt;<a href=3D"mailto:fot@au=
tox.team.net" target=3D"_blank">[email-masked]</a>&gt; wrote:</span></p=
></div><blockquote style=3D"margin-top:5pt;margin-bottom:5pt"><div><p><span=
 style=3D"font-size:10pt;color:black">=EF=BB=BF </span></p><div id=3D"gmail=
-m_-412229061168828563gmail-m_-8028308041457436653yiv9509520834yqt05668"><d=
iv><div><p><span style=3D"font-size:10pt;color:black">Welded rear gears are=
n&#39;t that fussy about lube, any good hypoid gear oil should be OK;</span=
></p></div><div><p><span style=3D"font-size:10pt;color:black">I usually use=
 80-90 Valvo in them.</span></p></div><div><p><span style=3D"font-size:10pt=
;color:black">The metal in the sample is a different story, they normally d=
on&#39;t &quot;make&quot; any metal in operation.</span></p></div><div><p><=
span style=3D"font-size:10pt;color:black">You&#39;ll have to remove the cov=
er &amp; get a visual on things, check the lash, mesh pattern &amp; preload=
s best possible in situ.</span></p></div><div><p><span style=3D"font-size:1=
0pt;color:black"> =C2=A0</span></p></div><div><p><span style=3D"font-size:1=
0pt;color:black">Glen Efinger</span></p></div><div><p><span style=3D"font-s=
ize:10pt;color:black"> =C2=A0</span></p></div><div><p><span style=3D"font-s=
ize:10pt;color:black"> =C2=A0</span></p></div><div><p style=3D"margin-botto=
m:12pt"><span style=3D"font-size:10pt;color:black">-----Original Message---=
--<br clear=3D"none">From: Philip Gott via Fot &lt;<a href=3D"mailto:fot@au=
tox.team.net" target=3D"_blank">[email-masked]</a>&gt;<br clear=3D"none=
">To: Friends Of Triumph &lt;<a href=3D"mailto:[email-masked]" target=
=3D"_blank">[email-masked]</a>&gt;<br clear=3D"none">Sent: Tue, Aug 9, =
2022 9:53 pm<br clear=3D"none">Subject: [Fot] Final drive (differential) oi=
l</span></p><div><p><span style=3D"font-size:10pt;color:black">Amici:</span=
></p></div><div><p><span style=3D"font-size:10pt;color:black">At the risk o=
f opening Pandora=E2=80=99s box, May I ask what gear oil you would recommen=
d for the rear end in my TR4A (solid axle)? I am running Mobil 1 75-140 and=
 found some metal flakes on my magnetic filler plug after Pitt Race. Usuall=
y there are some whiskers, but the metal flakes are concerning. The rear en=
d is a welded diff carrying a relatively new (3 seasons) 4.1 gear set.=C2=
=A0 I have yet to pull the cover. Backlash seems =E2=80=9Cnormal.=E2=80=9D =
The rear end was set up by Quantum Mechanics whom I trust.</span></p></div>=
<div><p><span style=3D"font-size:10pt;color:black">What do you all run for =
oil (brand and viscosity) and what is your experience?</span></p></div><div=
:10pt;color:black">_______________________________________________<br clear=
=3D"none"><a href=3D"mailto:[email-masked]" target=3D"_blank">fot@autox=
.team.net</a><br clear=3D"none"><br clear=3D"none"><a href=3D"http://www.fo=
t-racing.com" target=3D"_blank">http://www.fot-racing.com</a><br clear=3D"n=
one"><br clear=3D"none">Donate: <a href=3D"http://www.team.net/donate.html"=
 target=3D"_blank">http://www.team.net/donate.html</a><br clear=3D"none">Ar=
chive: <a href=3D"http://autox.team.net/archive" target=3D"_blank">http://a=
utox.team.net/archive</a> <a href=3D"http://www.team.net/pipermail/fot" tar=
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bscribe/Manage: <a href=3D"http://autox.team.net/mailman/options/fot/rkrame=
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[email-masked]</a><br clear=3D"none"><br clear=3D"none"></span></p></d=
iv></blockquote></div></div></div></div><div id=3D"gmail-m_-412229061168828=
563gmail-m_-8028308041457436653yiv9509520834yqt65412"><p style=3D"margin-bo=
ttom:12pt"><span style=3D"font-size:10pt;color:black">_____________________=
__________________________<br clear=3D"none"><a rel=3D"nofollow noopener no=
referrer" shape=3D"rect" href=3D"mailto:[email-masked]" target=3D"_blan=
k">[email-masked]</a><br clear=3D"none"><br clear=3D"none"><a rel=3D"no=
follow noopener noreferrer" shape=3D"rect" href=3D"http://www.fot-racing.co=
m/" target=3D"_blank">http://www.fot-racing.com</a><br clear=3D"none"><br c=
lear=3D"none">Donate: <a rel=3D"nofollow noopener noreferrer" shape=3D"rect=
" href=3D"http://www.team.net/donate.html" target=3D"_blank">http://www.tea=
m.net/donate.html</a><br clear=3D"none">Archive: <a rel=3D"nofollow noopene=
r noreferrer" shape=3D"rect" href=3D"http://autox.team.net/archive" target=
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oreferrer" shape=3D"rect" href=3D"http://www.team.net/pipermail/fot" target=
=3D"_blank">http://www.team.net/pipermail/fot</a><br clear=3D"none">Unsubsc=
ribe/Manage: <a rel=3D"nofollow noopener noreferrer" shape=3D"rect" href=3D=
"http://autox.team.net/mailman/options/fot/[email-masked]" target=3D"_blank=
">http://autox.team.net/mailman/options/fot/[email-masked]</a><br clear=3D"=
none"><br clear=3D"none"></span></p></div></div></div></div></div></div></d=
iv><div id=3D"gmail-m_-412229061168828563gmail-m_-8028308041457436653yqt860=
12">_______________________________________________<br clear=3D"none"><a sh=
ape=3D"rect" href=3D"mailto:[email-masked]" target=3D"_blank">fot@autox=
.team.net</a><br clear=3D"none"><br clear=3D"none"><a shape=3D"rect" href=
=3D"http://www.fot-racing.com/" target=3D"_blank">http://www.fot-racing.com=
</a><br clear=3D"none"><br clear=3D"none">Donate: <a shape=3D"rect" href=3D=
"http://www.team.net/donate.html" target=3D"_blank">http://www.team.net/don=
ate.html</a><br clear=3D"none">Archive: <a shape=3D"rect" href=3D"http://au=
tox.team.net/archive" target=3D"_blank">http://autox.team.net/archive </a><=
a shape=3D"rect" href=3D"http://www.team.net/pipermail/fot" target=3D"_blan=
k">http://www.team.net/pipermail/fot</a><br clear=3D"none">Unsubscribe/Mana=
ge: <a shape=3D"rect" href=3D"http://autox.team.net/mailman/options/fot/vfr=
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[email-masked]</a><br clear=3D"none"><br clear=3D"none"><br clear=3D"none=
"></div></div>_______________________________________________<br>
<a href=3D"mailto:[email-masked]" target=3D"_blank">[email-masked]<=
/a><br>
<br>
<a href=3D"http://www.fot-racing.com" rel=3D"noreferrer" target=3D"_blank">=
http://www.fot-racing.com</a><br>
<br>
et=3D"_blank">http://www.team.net/donate.html</a><br>
Archive: <a href=3D"http://autox.team.net/archive" rel=3D"noreferrer" targe=
t=3D"_blank">http://autox.team.net/archive</a> <a href=3D"http://www.team.n=
et/pipermail/fotUnsubscribe/Manage" rel=3D"noreferrer" target=3D"_blank">ht=
tp://www.team.net/pipermail/fot<br>
t/[email-masked]" rel=3D"noreferrer" target=3D"_blank">http:=
//autox.team.net/mailman/options/fot/[email-masked]</a><br>
<br>
<br>
</blockquote></div>
</div></blockquote></div></div></blockquote></div>

--000000000000496bb205e5fdd168--

--===============3732953082773531030==
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--===============3732953082773531030==--

---

From: Rick Parent via Fot <[email-masked]>
Date: Fri, 12 Aug 2022 01:59:01 +0000 (UTC)

--===============8574821126454647235==
	boundary="----=_Part_746815_634998744.1660269541071"

------=_Part_746815_634998744.1660269541071
Content-Transfer-Encoding: quoted-printable

I like the Swepco 201-80 weight, we use it in our Spit transmissions and di=
ffs, we also use it in our Cup Car and TA cars. My experience has not been =
good with the Red Line products. I learned about the Swepco oil in the late=
 70's, it's what Gurney used in the Indy cars and GTP cars. At the end of t=
he day Autozone gear oil would work so it's really not a difficult decision=
, just pick something and give it a try.
The heat is coming from the diff set up and while oil may help a few degree=
's it will not be the savior of your diff unfortunately.
Rick Parent
"Doing the right thing is always the right thing, regardless of consequence=
s"
=20

    On Thursday, August 11, 2022 at 06:34:35 PM MST, Enquiries Road & Track=
 via Fot <[email-masked]> wrote: =20
=20
 i offer some comments based on decades of dealing with this issue in lots =
of different race cars=C2=A0
to select=C2=A0the correct viscosity, you really=C2=A0need to know the oper=
ating temperature
Adhesive temp indicating labels on the outside of the main diff case are us=
ually=C2=A0the easiest method. they will give you a good idea of whats=C2=
=A0happening inside
typically, the outer case is a few degrees cooler that the circulating oil,=
 so be cautious=C2=A0here as it is most likely a lot "cooler" then the oil =
film between the ring and the pinion at the point of their contact
if you are seeing temps much over 100C on the outer, then the old 90 weight=
 diff oils are highly unlikely to acceptable
once most 'off-the-shelf" oils get to about 100C, they are starting to degr=
ade ,=C2=A0 some irrevocably (ie they are stuffed!!)
once you have an idea of temps , start looking at kinematic=C2=A0viscosity =
of the oil being suggested. simplistically, its this value that allow the o=
il to function as a metal to metal separator=C2=A0and the hotter things get=
, the lower the viscosity becomes, and the lower the chance of it keeping m=
etals apart. the various brands of "race oils" can differ widely in this re=
gard
in most=C2=A0modern rear-drive race cars we are using 140 grade purpose-mad=
e race gear oils, and these have all sorts of fancy additives=C2=A0
microfinishing the ring and pinion gears prior to a diff build, can drop wo=
rking temperatures considerably
hope this helps in some way
TerryAustralia

On Fri, Aug 12, 2022 at 12:35 AM Phil Gott via Fot <[email-masked]> wro=
te:

Thank you, everyone!
It would seem that lubes designed for the everyday street-driven car aren't=
 up to the challenge of racing our hyping diffs.=C2=A0 I thought the folks =
at Mobil would have done better, but apparently not enough.=C2=A0 I've take=
n all your inputs into consideration and going with the Redline Shockproof =
(lightweight) oil.=C2=A0 I'm also thinking of bolting on the aluminum cover=
 of the 4A IRS diff to get a little extra capacity and perhaps some better =
cooling, although the added thickness may offset the higher rate of heat tr=
ansfer through the metal.=C2=A0 Will do the math.
Your insights are much appreciated.
Regards,
Phil GottRed '65 4A, #114

-----Original Message-----
From: Alexandre Camoletti via Fot <[email-masked]>
To: [email-masked]
Sent: Thu, Aug 11, 2022 4:38 am
Subject: Re: [Fot] Final drive (differential) oil

 =C2=A0

 =C2=A0

 =C2=A0

Glen Efinger

 =C2=A0

 =C2=A0

-----Original Message-----
From: Bob Kramer Gmail via Fot <[email-masked]>
To: fubog1 <[email-masked]>
Cc: [email-masked]
Sent: Wed, Aug 10, 2022 11:51 am
Subject: Re: [Fot] Final drive (differential) oil

 =C2=A0

I=E2=80=99ve found EP90 GL4 from Car Quest (available from Advance) as a go=
od substitute for StaLube GL4, but it overheats and failed us in endurance =
racing.=C2=A0 It has always worked in the shorter vintage race, and is chea=
p enough the drain and refill often.=C2=A0

 =C2=A0

Sent from my iPhone

=EF=BB=BF=20

 =C2=A0

Glen Efinger

 =C2=A0

 =C2=A0

-----Original Message-----
From: Philip Gott via Fot <[email-masked]>
To: Friends Of Triumph <[email-masked]>
Sent: Tue, Aug 9, 2022 9:53 pm
Subject: [Fot] Final drive (differential) oil

Amici:

Thanks and regards,

Phil

 =C2=A0

Sent from my iPhone

[email-masked]

 =C2=A0

 =C2=A0

m

 =C2=A0

 =C2=A0

dandtrack.net.au

tt.net

 =20
------=_Part_746815_634998744.1660269541071
Content-Transfer-Encoding: quoted-printable

<html><head></head><body><div class=3D"ydp4fa6b0ebyahoo-style-wrap" style=
=3D"font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:16px=
;"><div><div dir=3D"ltr" data-setdir=3D"false">I like the Swepco 201-80 wei=
ght, we use it in our Spit transmissions and diffs, we also use it in our C=
up Car and TA cars. My experience has not been good with the Red Line produ=
cts. I learned about the Swepco oil in the late 70's, it's what Gurney used=
 in the Indy cars and GTP cars. At the end of the day Autozone gear oil wou=
ld work so it's really not a difficult decision, just pick something and gi=
ve it a try.</div><div dir=3D"ltr" data-setdir=3D"false"><br></div><div dir=
=3D"ltr" data-setdir=3D"false">The heat is coming from the diff set up and =
while oil may help a few degree's it will not be the savior of your diff un=
fortunately.</div><div><br></div><div class=3D"ydp4fa6b0ebsignature"><div s=
tyle=3D"font-family:Helvetica, Arial, sans-serif;font-size:16px;"><div dir=
=3D"ltr">Rick Parent</div><div dir=3D"ltr"><br></div><div dir=3D"ltr">"<i>D=
oing the right thing is always the right thing, regardless of consequences<=
/i>"</div><div dir=3D"ltr"><br></div></div></div></div>
        <div><br></div><div><br></div>
       =20
        </div><div id=3D"yahoo_quoted_0334852148" class=3D"yahoo_quoted">
            <div style=3D"font-family:'Helvetica Neue', Helvetica, Arial, s=
ans-serif;font-size:13px;color:#26282a;">
               =20
                <div>
                    On Thursday, August 11, 2022 at 06:34:35 PM MST, Enquir=
ies Road &amp; Track via Fot &lt;[email-masked]&gt; wrote:
                </div>
                <div><br></div>
                <div><br></div>
                <div><div id=3D"yiv7939431619"><div><div dir=3D"ltr">i offe=
r some comments based on decades of dealing with this issue in lots of diff=
erent race cars&nbsp;<div><br clear=3D"none"></div><div>to select&nbsp;the =
correct viscosity, you really&nbsp;need to know the operating temperature</=
div><div><br clear=3D"none"></div><div>Adhesive temp indicating labels on t=
he outside of the main diff case are usually&nbsp;the easiest method. they =
will give you a good idea of whats&nbsp;happening inside</div><div><br clea=
r=3D"none"></div><div>typically, the outer case is a few degrees cooler tha=
t the circulating oil, so be cautious&nbsp;here as it is most likely a lot =
"cooler" then the oil film between the ring and the pinion at the point of =
their contact</div><div><br clear=3D"none"></div><div>if you are seeing tem=
ps much over 100C on the outer, then the old 90 weight diff oils are highly=
 unlikely to acceptable</div><div><br clear=3D"none"></div><div>once most '=
off-the-shelf" oils get to about 100C, they are starting to degrade ,&nbsp;=
 some irrevocably (ie they are stuffed!!)</div><div><br clear=3D"none"></di=
v><div>once you have an idea of temps , start looking at kinematic&nbsp;vis=
cosity of the oil being suggested. simplistically, its this value that allo=
w the oil to function as a metal to metal separator&nbsp;and the hotter thi=
ngs get, the lower the viscosity becomes, and the lower the chance of it ke=
eping metals apart. the various brands of "race oils" can differ widely in =
this regard</div><div><br clear=3D"none"></div><div>in most&nbsp;modern rea=
r-drive race cars we are using 140 grade purpose-made race gear oils, and t=
hese have all sorts of fancy additives&nbsp;</div><div><br clear=3D"none"><=
/div><div>microfinishing the ring and pinion gears prior to a diff build, c=
an drop working temperatures considerably</div><div><br clear=3D"none"></di=
v><div>hope this helps in some way</div><div><div><div dir=3D"ltr" class=3D=
"yiv7939431619gmail_signature"><div dir=3D"ltr"><div><div dir=3D"ltr"><div>=
<div dir=3D"ltr"><div><div dir=3D"ltr"><div><div dir=3D"ltr"><div><div dir=
=3D"ltr"><div><br clear=3D"none"></div><div>Terry</div><div>Australia<br cl=
ear=3D"none"><br clear=3D"none"></div></div></div></div></div></div></div><=
/div></div></div></div></div></div></div><br clear=3D"none"></div></div><br=
 clear=3D"none"><div class=3D"yiv7939431619gmail_quote"><div id=3D"yiv79394=
31619yqt39131" class=3D"yiv7939431619yqt0936000716"><div dir=3D"ltr" class=
=3D"yiv7939431619gmail_attr">On Fri, Aug 12, 2022 at 12:35 AM Phil Gott via=
 Fot &lt;<a rel=3D"nofollow noopener noreferrer" shape=3D"rect" ymailto=3D"=
mailto:[email-masked]" target=3D"_blank" href=3D"mailto:[email-masked].=
net">[email-masked]</a>&gt; wrote:<br clear=3D"none"></div><blockquote =
style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);pa=
dding-left:1ex;" class=3D"yiv7939431619gmail_quote"><div style=3D"font-size=
:10pt;font-family:arial, helvetica, sans-serif;color:black;"><div style=3D"=
font-family:arial, helvetica, sans-serif;font-size:10pt;color:black;">Thank=
 you, everyone!</div><div style=3D"font-family:arial, helvetica, sans-serif=
;font-size:10pt;color:black;"><br clear=3D"none"></div><div style=3D"font-f=
amily:arial, helvetica, sans-serif;font-size:10pt;color:black;">It would se=
em that lubes designed for the everyday street-driven car aren't up to the =
challenge of racing our hyping diffs.&nbsp; I thought the folks at Mobil wo=
uld have done better, but apparently not enough.&nbsp; I've taken all your =
inputs into consideration and going with the Redline Shockproof (lightweigh=
t) oil.&nbsp; I'm also thinking of bolting on the aluminum cover of the 4A =
IRS diff to get a little extra capacity and perhaps some better cooling, al=
though the added thickness may offset the higher rate of heat transfer thro=
ugh the metal.&nbsp; Will do the math.</div><div style=3D"font-family:arial=
, helvetica, sans-serif;font-size:10pt;color:black;"><br clear=3D"none"></d=
iv><div style=3D"font-family:arial, helvetica, sans-serif;font-size:10pt;co=
lor:black;">Your insights are much appreciated.</div><div style=3D"font-fam=
ily:arial, helvetica, sans-serif;font-size:10pt;color:black;"><br clear=3D"=
none"></div><div style=3D"font-family:arial, helvetica, sans-serif;font-siz=
e:10pt;color:black;">Regards,</div><div style=3D"font-family:arial, helveti=
ca, sans-serif;font-size:10pt;color:black;"><br clear=3D"none"></div><div s=
tyle=3D"font-family:arial, helvetica, sans-serif;font-size:10pt;color:black=
;">Phil Gott</div><div style=3D"font-family:arial, helvetica, sans-serif;fo=
nt-size:10pt;color:black;">Red '65 4A, #114<br clear=3D"none"><br clear=3D"=
none"><br clear=3D"none">-----Original Message-----<br clear=3D"none">From:=
 Alexandre Camoletti via Fot &lt;<a rel=3D"nofollow noopener noreferrer" sh=
ape=3D"rect" ymailto=3D"mailto:[email-masked]" target=3D"_blank" href=
=3D"mailto:[email-masked]">[email-masked]</a>&gt;<br clear=3D"none"=
>To: <a rel=3D"nofollow noopener noreferrer" shape=3D"rect" ymailto=3D"mail=
to:[email-masked]" target=3D"_blank" href=3D"mailto:[email-masked]"=
>[email-masked]</a><br clear=3D"none">Sent: Thu, Aug 11, 2022 4:38 am<b=
r clear=3D"none">Subject: Re: [Fot] Final drive (differential) oil<br clear=
=3D"none"><br clear=3D"none"></div><div id=3D"yiv7939431619gmail-m_-8028308=
041457436653yiv9509520834"><div><div><p><span style=3D"color:rgb(68,84,106)=
;">Gents, when heats becomes a problem then you should definitely try the L=
ucas oils. Measure temperatures before and after the change, the difference=
 is usually quite big&nbsp;!</span></p><p><span style=3D"color:rgb(68,84,10=
6);"> &nbsp;</span></p><p><b><span lang=3D"FR" style=3D"font-size:10pt;">De=
&nbsp;:</span></b><span lang=3D"FR" style=3D"font-size:10pt;"> Fot [mailto:=
<a rel=3D"nofollow noopener noreferrer" shape=3D"rect" ymailto=3D"mailto:fo=
[email-masked]" target=3D"_blank" href=3D"mailto:fot-bounces@auto=
x.team.net">[email-masked]</a>] <b>De la part de</b> fubog1 via=
 Fot<br clear=3D"none"><b>Envoy=C3=A9&nbsp;:</b> mercredi 10 ao=C3=BBt 2022=
 19:25<br clear=3D"none"><b>=C3=80&nbsp;:</b> <a rel=3D"nofollow noopener n=
oreferrer" shape=3D"rect" ymailto=3D"mailto:[email-masked]" target=3D"_=
blank" href=3D"mailto:[email-masked]">[email-masked]</a><br clear=
=3D"none"><b>Cc&nbsp;:</b> <a rel=3D"nofollow noopener noreferrer" shape=3D=
"rect" ymailto=3D"mailto:[email-masked]" target=3D"_blank" href=3D"mail=
to:[email-masked]">[email-masked]</a><br clear=3D"none"><b>Objet&nb=
sp;:</b> Re: [Fot] Final drive (differential) oil</span></p><p> &nbsp;</p><=
div id=3D"yiv7939431619gmail-m_-8028308041457436653yiv9509520834yqt75679"><=
div><div><p><span style=3D"font-size:10pt;color:black;">Bob you bring up an=
other good point as well, there's a big difference between a 20 minute spri=
nt race &amp; an enduro, the heat is a much bigger consideration...</span><=
/p></div><div><p><span style=3D"font-size:10pt;color:black;"> &nbsp;</span>=
</p></div><div><p><span style=3D"font-size:10pt;color:black;">Glen Efinger<=
/span></p></div><div><p><span style=3D"font-size:10pt;color:black;"> &nbsp;=
</span></p></div><div><p><span style=3D"font-size:10pt;color:black;"> &nbsp=
;</span></p></div><div><p style=3D"margin-bottom:12pt;"><span style=3D"font=
-size:10pt;color:black;">-----Original Message-----<br clear=3D"none">From:=
 Bob Kramer Gmail via Fot &lt;<a rel=3D"nofollow noopener noreferrer" shape=
=3D"rect" ymailto=3D"mailto:[email-masked]" target=3D"_blank" href=3D"m=
ailto:[email-masked]">[email-masked]</a>&gt;<br clear=3D"none">To: =
fubog1 &lt;<a rel=3D"nofollow noopener noreferrer" shape=3D"rect" ymailto=
=3D"mailto:[email-masked]" target=3D"_blank" href=3D"mailto:[email-masked]"=
>[email-masked]</a>&gt;<br clear=3D"none">Cc: <a rel=3D"nofollow noopener n=
oreferrer" shape=3D"rect" ymailto=3D"mailto:[email-masked]" target=3D"_=
blank" href=3D"mailto:[email-masked]">[email-masked]</a><br clear=
=3D"none">Sent: Wed, Aug 10, 2022 11:51 am<br clear=3D"none">Subject: Re: [=
Fot] Final drive (differential) oil</span></p><div id=3D"yiv7939431619gmail=
-m_-8028308041457436653yiv9509520834"><div><p><span style=3D"font-size:10pt=
;color:black;">Good point Glen. Welding up the center section makes the sof=
t yellow metal cone washers moot.&nbsp; </span></p><div><p><span style=3D"f=
ont-size:10pt;color:black;"> &nbsp;</span></p></div><div><p><span style=3D"=
font-size:10pt;color:black;">I=E2=80=99ve found EP90 GL4 from Car Quest (av=
ailable from Advance) as a good substitute for StaLube GL4, but it overheat=
s and failed us in endurance racing.&nbsp; It has always worked in the shor=
ter vintage race, and is cheap enough the drain and refill often.&nbsp;</sp=
an></p><div><p><span style=3D"font-size:10pt;color:black;"> &nbsp;</span></=
p><div><p><span style=3D"font-size:10pt;color:black;">Sent from my iPhone</=
span></p></div><div><p><span style=3D"font-size:10pt;color:black;"><br clea=
r=3D"none"><br clear=3D"none"></span></p><p style=3D"margin-bottom:12pt;"><=
span style=3D"font-size:10pt;color:black;">On Aug 10, 2022, at 10:03 AM, fu=
bog1 via Fot &lt;<a rel=3D"nofollow noopener noreferrer" shape=3D"rect" yma=
ilto=3D"mailto:[email-masked]" target=3D"_blank" href=3D"mailto:fot@aut=
ox.team.net">[email-masked]</a>&gt; wrote:</span></p></div><blockquote =
style=3D"margin-top:5pt;margin-bottom:5pt;"><div><p><span style=3D"font-siz=
e:10pt;color:black;">=EF=BB=BF </span></p><div id=3D"yiv7939431619gmail-m_-=
8028308041457436653yiv9509520834yqt05668"><div><div><p><span style=3D"font-=
size:10pt;color:black;">Welded rear gears aren't that fussy about lube, any=
 good hypoid gear oil should be OK;</span></p></div><div><p><span style=3D"=
font-size:10pt;color:black;">I usually use 80-90 Valvo in them.</span></p><=
/div><div><p><span style=3D"font-size:10pt;color:black;">The metal in the s=
ample is a different story, they normally don't "make" any metal in operati=
on.</span></p></div><div><p><span style=3D"font-size:10pt;color:black;">You=
'll have to remove the cover &amp; get a visual on things, check the lash, =
mesh pattern &amp; preloads best possible in situ.</span></p></div><div><p>=
<span style=3D"font-size:10pt;color:black;"> &nbsp;</span></p></div><div><p=
><span style=3D"font-size:10pt;color:black;">Glen Efinger</span></p></div><=
div><p><span style=3D"font-size:10pt;color:black;"> &nbsp;</span></p></div>=
<div><p><span style=3D"font-size:10pt;color:black;"> &nbsp;</span></p></div=
><div><p style=3D"margin-bottom:12pt;"><span style=3D"font-size:10pt;color:=
black;">-----Original Message-----<br clear=3D"none">From: Philip Gott via =
Fot &lt;<a rel=3D"nofollow noopener noreferrer" shape=3D"rect" ymailto=3D"m=
ailto:[email-masked]" target=3D"_blank" href=3D"mailto:[email-masked]=
et">[email-masked]</a>&gt;<br clear=3D"none">To: Friends Of Triumph &lt=
;<a rel=3D"nofollow noopener noreferrer" shape=3D"rect" ymailto=3D"mailto:f=
[email-masked]" target=3D"_blank" href=3D"mailto:[email-masked]">fot=
@autox.team.net</a>&gt;<br clear=3D"none">Sent: Tue, Aug 9, 2022 9:53 pm<br=
 clear=3D"none">Subject: [Fot] Final drive (differential) oil</span></p><di=
v><p><span style=3D"font-size:10pt;color:black;">Amici:</span></p></div><di=
v><p><span style=3D"font-size:10pt;color:black;">At the risk of opening Pan=
dora=E2=80=99s box, May I ask what gear oil you would recommend for the rea=
r end in my TR4A (solid axle)? I am running Mobil 1 75-140 and found some m=
etal flakes on my magnetic filler plug after Pitt Race. Usually there are s=
ome whiskers, but the metal flakes are concerning. The rear end is a welded=
 diff carrying a relatively new (3 seasons) 4.1 gear set.&nbsp; I have yet =
to pull the cover. Backlash seems =E2=80=9Cnormal.=E2=80=9D The rear end wa=
s set up by Quantum Mechanics whom I trust.</span></p></div><div><p><span s=
tyle=3D"font-size:10pt;color:black;">What do you all run for oil (brand and=
 viscosity) and what is your experience?</span></p></div><div><p><span styl=
e=3D"font-size:10pt;color:black;">Thanks and regards,</span></p></div><div>=
<p><span style=3D"font-size:10pt;color:black;">Phil</span></p></div><div><p=
><span style=3D"font-size:10pt;color:black;"> &nbsp;</span></p></div><div><=
p><span style=3D"font-size:10pt;color:black;">Sent from my iPhone</span></p=
></div><div><p><span style=3D"font-size:10pt;color:black;">________________=
_______________________________</span></p></div><div><p><span style=3D"font=
-size:10pt;color:black;"><a rel=3D"nofollow noopener noreferrer" shape=3D"r=
ect" ymailto=3D"mailto:[email-masked]" target=3D"_blank" href=3D"mailto=
:[email-masked]">[email-masked]</a></span></p></div><div><p><span s=
tyle=3D"font-size:10pt;color:black;"> &nbsp;</span></p></div><div><p><span =
style=3D"font-size:10pt;color:black;"><a rel=3D"nofollow noopener noreferre=
r" shape=3D"rect" target=3D"_blank" href=3D"http://www.fot-racing.com/">htt=
p://www.fot-racing.com</a></span></p></div><div><p><span style=3D"font-size=
:10pt;color:black;"> &nbsp;</span></p></div><div><p><span style=3D"font-siz=
e:10pt;color:black;">Donate: <a rel=3D"nofollow noopener noreferrer" shape=
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n-bottom:12pt;"><span style=3D"font-size:10pt;color:black;">_______________=
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</div></div><div class=3D"yqt0936000716" id=3D"yqt89516">__________________=
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