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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 <jgwolford@aol.com> =
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?
>
> Thanks,
>
> Jim W.
> _______________________________________________
>
> Oletrucks@autox.team.net
> Donate: http://www.team.net/donate.html
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>
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<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 '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" 10 bolts from '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'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 <<a hre=
f=3D"mailto:jgwolford@aol.com";>jgwolford@aol.com</a>> 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:Oletrucks@autox.team.net"; 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/miq@bigllama.com" rel=3D"noreferrer" target=3D"_blank">http://autox.tea=
m.net/mailman/options/oletrucks/miq@bigllama.com</a><br>
</blockquote></div>
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_______________________________________________
Oletrucks@autox.team.net
Archive: http://www.team.net/pipermail/oletrucks
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