Subject: Re: [Oletrucks] Task Force Differentials

From: James Wolford <[email-masked]>
Date: Thu, 16 May 2024 17:27:00 +0000 (UTC)

--===============5496806449023860350==
	boundary="----=_Part_482168_374174323.1715880420678"

------=_Part_482168_374174323.1715880420678
Content-Transfer-Encoding: quoted-printable

Hello all,
I have a 1957 Chevrolet 3100 pickup.=C2=A0 It currently has an open rear en=
d and I believe the gears are 390 or the same as the sedan.=C2=A0 I am wond=
ering about replacing the center section with a posi unit and was wondering=
 if a 8.5 would work?
Thanks,
Jim W.

------=_Part_482168_374174323.1715880420678
Content-Transfer-Encoding: 7bit

<html><head></head><body><div class="yahoo-style-wrap" style="font-family:arial;font-size:16px;"><div dir="ltr" data-setdir="false">Hello all,</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">I have a 1957 Chevrolet 3100 pickup.&nbsp; It currently has an open rear end and I believe the gears are 390 or the same as the sedan.&nbsp; I am wondering about replacing the center section with a posi unit and was wondering if a 8.5 would work?</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">Thanks,</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">Jim W.<br></div></div></body></html>
------=_Part_482168_374174323.1715880420678--

--===============5496806449023860350==
Content-Transfer-Encoding: 7bit
Content-Disposition: inline

_______________________________________________

[email-masked]
Archive: http://www.team.net/pipermail/oletrucks

--===============5496806449023860350==--

---

From: MIQ MILLMAN <[email-masked]>
Date: Thu, 23 May 2024 07:21:12 -0700

--===============4236684942959508255==

--0000000000001dd74706191fc4f7
Content-Transfer-Encoding: quoted-printable

Sorry for the late reply James.  I had to go through my paper archives from
when I modded my '57 3200.

Stock is 3.90:1 or 4:11:1 -- it depended on which transmission was
originally in the truck.

8.5" 10 bolts from '73 - '87 (Square Body) should fit.

I actually went a different route:  I put in a 1989 Camaro Z28 rear end,
that had both a posi-trac and disc brakes--this was a Borg Warner 9-bolt
with a 3:27:1 ratio-- this is also a smaller ring gear, 7.75, but was more
than adequate with my fuelie head/fenton headered/HEI 235 hotrod engine at
the time, especially since I also retained the 4 speed with granny 1st
gear..  I fixed the slight change in width by changing the offset on the
wheels I used.

In the drag world, the 9 bolt is sometimes considered to be a much superior
choice to the 10 bolt.  IF you go that route, make sure to get the 11 tooth
pinion/ 41 tooth ring if you go for the 3:73:1--it's much stronger than the
10 tooth pinion/37 tooth ring.

   --Miq

On Thu, May 16, 2024 at 11:20=E2=80=AFAM James Wolford <[email-masked]> =
wrote:

> Hello all,
>
> I have a 1957 Chevrolet 3100 pickup.  It currently has an open rear end
> and I believe the gears are 390 or the same as the sedan.  I am wondering
> about replacing the center section with a posi unit and was wondering if =
a
> 8.5 would work?
> Donate: http://www.team.net/donate.html
> Suggested annual donation  $11.47
> Unsubscribe/Manage:
> http://autox.team.net/mailman/options/oletrucks/[email-masked]
>

--0000000000001dd74706191fc4f7
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Sorry for the late reply James.=C2=A0 I had to go through =
my paper archives from when I modded my &#39;57 3200.<div><br></div><div>St=
ock is 3.90:1 or 4:11:1 -- it depended on which transmission was originally=
 in the truck.</div><div><br></div><div>8.5&quot; 10 bolts from &#39;73 - &=
#39;87 (Square Body) should fit.</div><div><br></div><div>I actually went a=
 different route:=C2=A0 I put in a 1989 Camaro Z28 rear end, that had both =
a posi-trac and disc brakes--this was a Borg Warner 9-bolt with a 3:27:1 ra=
tio-- this is also a smaller ring gear, 7.75, but was more than adequate wi=
th my fuelie head/fenton headered/HEI 235 hotrod engine at the time, especi=
ally since I also retained the 4 speed with granny 1st gear..=C2=A0 I fixed=
 the slight change in width by changing the offset on the wheels I used.</d=
iv><div><br></div><div>In the drag world, the 9 bolt is sometimes considere=
d to be a much superior choice to the 10 bolt.=C2=A0 IF you go that route, =
make sure to get the 11 tooth pinion/ 41 tooth ring if you go for the 3:73:=
1--it&#39;s much stronger than the 10 tooth pinion/37 tooth ring.</div><div=
><br></div><div><br></div><div>=C2=A0 =C2=A0--Miq</div><div><br></div><div>=
<br></div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gm=
ail_attr">On Thu, May 16, 2024 at 11:20=E2=80=AFAM James Wolford &lt;<a hre=
f=3D"mailto:[email-masked]">[email-masked]</a>&gt; wrote:<br></div><b=
lockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-le=
ft:1px solid rgb(204,204,204);padding-left:1ex"><div><div style=3D"font-fam=
ily:arial;font-size:16px"><div dir=3D"ltr">Hello all,</div><div dir=3D"ltr"=
><br></div><div dir=3D"ltr">I have a 1957 Chevrolet 3100 pickup.=C2=A0 It c=
urrently has an open rear end and I believe the gears are 390 or the same a=
s the sedan.=C2=A0 I am wondering about replacing the center section with a=
 posi unit and was wondering if a 8.5 would work?</div><div dir=3D"ltr"><br=
></div><div dir=3D"ltr">Thanks,</div><div dir=3D"ltr"><br></div><div dir=3D=
"ltr">Jim W.<br></div></div></div>_________________________________________=
______<br>
<br>
<a href=3D"mailto:[email-masked]" target=3D"_blank">Oletrucks@aut=
ox.team.net</a><br>
et=3D"_blank">http://www.team.net/donate.html</a><br>
Archive: <a href=3D"http://www.team.net/pipermail/oletrucks" rel=3D"norefer=
rer" target=3D"_blank">http://www.team.net/pipermail/oletrucks</a><br>
<br>
cks/[email-masked]" rel=3D"noreferrer" target=3D"_blank">http://autox.tea=
m.net/mailman/options/oletrucks/[email-masked]</a><br>
</blockquote></div>

--0000000000001dd74706191fc4f7--

--===============4236684942959508255==
Content-Transfer-Encoding: 7bit
Content-Disposition: inline

[email-masked]

--===============4236684942959508255==--