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Old 10-17-2018, 06:44 PM   #1
chevyhed53
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Rear end ID

Double-checking the ID on my rear end after removing the driveshaft. Back side looks like a typical 8.5 10-bolt GM, but the driveshaft side is less certain, no U-bolts, no "straps," just four 7/16" bolts. Any help ID'd this is appreciated.
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Old 10-17-2018, 10:55 PM   #2
Captainfab
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Re: Rear end ID

I see the ears on top of the center section for the upper suspension arms used in passenger cars. I'm going to guess that your wheel stud pattern is 5 x 4.75? The pinion flange looks to be designed for a CV joint.
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Old 10-17-2018, 11:06 PM   #3
chevyhed53
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Re: Rear end ID

Bolt pattern is 5x5. The flange doesn't match up with anything I've found online or in shop manuals. I'm swapping out my 350TH transmission for a 4-speed, and I'm planning on reusing the driveshaft, so it doesn't matter all that much, but I'd love to know what it is!
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Old 10-18-2018, 07:14 AM   #4
PGSigns
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Re: Rear end ID

Looks like may be Oldsmobile. They had a 12 bolt (ring gear bolts) with a 10 bolt rear cover that used a flange like that. Looked at a C20 last year with a 455 in it and it had the Olds rear in it, It was 5 on 5. Had that flange with a 3" thick spacer in it to make the drive shaft work.
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Old 10-18-2018, 10:08 AM   #5
chevyhed53
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Re: Rear end ID

Thanks. Swapping in a beefed-up Saginaw 4-speed, so the measurements should stay the same.
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Old 10-18-2018, 10:28 AM   #6
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Re: Rear end ID

Quote:
Originally Posted by chevyhed53 View Post
Thanks. Swapping in a beefed-up Saginaw 4-speed, so the measurements should stay the same.
Beefed up Saginaw!
Where would you get one of them?
What’s the first gear ratio in it?
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Old 10-18-2018, 12:35 PM   #7
chevyhed53
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Re: Rear end ID

2.84. Rebuilt by someone I know, so I'm keeping my fingers crossed. I know the warnings about Saginaws not being able to handle much, but I'm not going to be doing any drag racing!
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Old 10-18-2018, 12:44 PM   #8
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Re: Rear end ID

As long as you don’t sidestep the clutch pedal and treat it nice it’ll last.
I ran a 3.11 gear one behind an L34 396 and an LS6 454 for awhile.
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Old 10-18-2018, 12:47 PM   #9
chevyhed53
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Re: Rear end ID

That's encouraging! I'm running a 400SBC.
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