1956 chevy pickup rear pumpkin identify need help

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Baprace
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1956 chevy pickup rear pumpkin identify need help

Post by Baprace »

Customer took this picture of 1956 chevy pickup 1/2 ton rear end , he say's the chunk is held in by 12 bolts , I can't identify the make / model , the ujoint flange is unusual , can anyone identify if this is a stock rear ? Customer say's the rear has 5 x 5 wheels.
56chev.jpg
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Re: 1956 chevy pickup rear pumpkin identify need help

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Last edited by Baprace on Sat Dec 18, 2021 9:02 pm, edited 1 time in total.
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Re: 1956 chevy pickup rear pumpkin identify need help

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Baprace wrote: Fri Dec 17, 2021 2:00 pm Customer took this picture of 1956 chevy pickup 1/2 ton rear end , he say's the chunk is held in by 12 bolts , I can't identify the make / model , the ujoint flange is unusual , can anyone identify if this is a stock rear ? Customer say's the rear has 5 x 5 wheels.

56chev.jpg
Customer has told me this is a 1956 GMC truck not a Chevy need help identifying the ujoint type , is it a GM style ?
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Re: 1956 chevy pickup rear pumpkin identify need help

Post by chevyfreak »

About 15yrs ago i was into the apache builds. Gmc did it different back then,
And from my memory, there was 2 differentials used.
GM SS H033 or a spicer 45.
Hope it helps.


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Re: 1956 chevy pickup rear pumpkin identify need help

Post by In-Tech »

Hiya,
I just asked a bud of mine that does rear ends, 55-64 Spicer 45, GMC only has 10 bolts.
Some more info he sent.
Rear Axle Identification, 55-66.pdf
You might try the trifive website https://www.trifive.com/

https://www.summitracing.com/parts/mgr-g884308
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Re: 1956 chevy pickup rear pumpkin identify need help

Post by dannobee »

5x5 is the big GM car bolt pattern. From the looks of the pumpkin bolts and the goofy U-joint, I'd say it was the late 50's, early 60's Cadillac rear end.
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Re: 1956 chevy pickup rear pumpkin identify need help

Post by bthomas »

bolt count, case ribs, and yoke match this 56 caddy 3rd member
https://www.ebay.com/itm/1956-CADILLAC- ... 3950924560
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Re: 1956 chevy pickup rear pumpkin identify need help

Post by Baprace »

Thanks guy's for the help , I believe the 1956 Cadillac rear is the correct id. this site is awesome. =D> =D>
Merry Christmas to everyone.
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Re: 1956 chevy pickup rear pumpkin identify need help

Post by dfarr67 »

I would ask- why was it changed to the caddy?
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Re: 1956 chevy pickup rear pumpkin identify need help

Post by PackardV8 »

dfarr67 wrote: Mon Dec 27, 2021 6:38 pm I would ask- why was it changed to the caddy?
Maybe it was OEM. GMC used Pontiac and Buick V8s and the original Hydramatic transmission, so maybe it also used the big car rear axle. Some years, when the Chev used a closed torque tube, the GMC version used an open driveline. In 1960, when Chevrolet pickups began using coil springs and truck arms, some GMC pickups used leaf springs.
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