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Old 12-09-2012, 02:03 PM
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Help ID this GM rear end in my '57 Chevy 3100 truck...

Hello!

This is my first post, so Hello! from Monroe, CT.

Here's why I'm posting...

This summer, a '57 Chevy 3100 pickup followed me home. It's an older resto that's been worked a bit...400sbc, turbo 400, and a posi rear end. The work appears to be solid and well done.

Anyway, when I bought the truck, the brake pedal sank to the floor, so I pulled apart the brakes, and found that I need an old fashioned brake job, along with a wheel cyl on the pass side. The previous owner (PO), left out all of the self adjusting AND the e-brake hardware, including the strut arm, and I want an E-brake, so I have to find the parts. Here's where it gets interesting, and the reason for my post...

I CANNOT positively ID the rear end, and I have to in order to get the proper brake parts. Here's what I've got...

It's a 10 bolt posi GM rear with 2.73 rear end gears.

Posi clutch is 2 plates between the spider gears held apart by 4 springs

Part # on the gear is 3984825 41 15 (tooth count). There is NO mfg date

Ring gear bolt heads are 3/4"

Carrier # is 32267

Numbers stamped on the front of the pass side axle tube are: NT K 084E

Bolt pattern is 5 x 5

Brakes are 11" x 2"

Wheel cyl has 29471 cast into it

This was a coil spring/trailing arm rear end - top of rear has trailing arm lugs cast into it, and I can see where the bottom mounts were cut off
The driveshaft has 2 u-joint mounted in a coupling at the rear end side

I've been digging for hours, along with posting on the HAMB, and from what I can find, the rear might be from a 71 - 76 GM full size, specifically a full size Pontiac.

Can anyone ID this rear end for me?

Last question - anyone know a vendor who sells GM e-brake strut levers?


Thanks in advance...

Chris
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Last edited by Barsteel; 12-09-2012 at 02:09 PM.
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Old 12-09-2012, 05:11 PM
big gear head's Avatar
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Looks like a GM corporate 8.5 from a full size GM car. IF the posi has 4 springs then it's an after market Eaton that someone has installed.
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Old 12-09-2012, 05:30 PM
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Searched for images for an 8.5" GM corporate rear, and it does have the lugs at the lower corners like an 8.5. I'll check the pinion nut size tomorrow...if it's 1 1/4", that will ID it as an 8.5, at least according to what I've found online.

Anyway to date it?

What cars would have this rear end come in? I ordered brake shoes from a '76 Impala, and they matched what's in there now, but I don't know if there's any different between Chevy brakes and Buick/Olds/Pontiac brakes.

Thanks...

Chris

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Originally Posted by big gear head View Post
Looks like a GM corporate 8.5 from a full size GM car. IF the posi has 4 springs then it's an after market Eaton that someone has installed.
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Old 12-09-2012, 09:19 PM
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Should be a Casting # and Date code on the Webs where Center joins Axle tubes.
Also a stamped code on the right axle tube.
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Old 12-19-2012, 05:01 AM
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Quote:
Originally Posted by SSedan64 View Post
Should be a Casting # and Date code on the Webs where Center joins Axle tubes.
Also a stamped code on the right axle tube.
What he said.
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