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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 <fot@autox.team.net>
To: fubog1 <fubog1@aol.com>
Cc: fot@autox.team.net
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
On Aug 10, 2022, at 10:03 AM, fubog1 via Fot <fot@autox.team.net> wrote:
=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 <fot@autox.team.net>
To: Friends Of Triumph <fot@autox.team.net>
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
_______________________________________________
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m
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il.com
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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 & an enduro, the heat=
is a much bigger consideration...</font></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=
size=3D"2">-----Original Message-----<br>
From: Bob Kramer Gmail via Fot <fot@autox.team.net><br>
To: fubog1 <fubog1@aol.com><br>
Cc: fot@autox.team.net<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.
<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. It has always worked in the shorter vintage race, and is=
cheap enough the drain and refill often. <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 <fot@autox.team.net> 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 & get a visual on=
things, check the lash, mesh pattern & 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 <fot@autox.team.net><br clear=3D"none">
To: Friends Of Triumph <fot@autox.team.net><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. 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>
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</blockquote></div>
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