What rear end is this?

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565bbchevy

Geezer
G-Body of the Month
Aug 8, 2011
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This is in an 87' Cutlass that is for sale, just not sure what rear this is.

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79 USA 1

Royal Smart Person
Sep 2, 2011
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Cheektowaga, New York
That looks to be a 67-70 Oldsmobile 12 bolt "O" axle. Has a 10 bolt 8.5 ring gear and bolt on (Non C Clip) axles.. Below is some background on it.
 
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79 USA 1

Royal Smart Person
Sep 2, 2011
1,065
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Cheektowaga, New York
Yup could be, the bolts are in the wrong place for the 8.2
Yes, It actually is a 12 bolt cover but a 10 bolt ring gear.
My youngest brother had one in a 68 Cutlass many years ago that we were going to remove when he sold the engine and body shell. We asked a few folks we knew who worked at "Chevy Delavan" (American Axle Buffalo New York.) about this rear axle and we were told it had nothing in common with the 12 bolt "C" axle (Chevrolet 12 bolt) and that it would cost twice the price for performance upgrades and be less than 1/2 as strong. We ended up letting it go with the body shell.
 
Oct 14, 2008
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Melville,Saskatchewan
My understanding, only 2 aftermarket covers are available for the Oldsmobile 12 bolt 8.5" rear. The W27 modeled after the aluminum diff option available on 1970 W cars. The other is the LPW girdle cover. Decently strong rear ends with bolt in axles. Gears are expensive and limited, 3.42 and 3.90 aftermarket, that use the 3.08-3.23 carrier. The posi are modified Ferd 8.8 28 spline carriers. I have used 3.08 and a new, ridiculously expensive Yukon posi to go in my 70S. Just need bearings, seals and a reproduction W27 cover. Is it a 12 bolt chebby? That is my guess.
 

565bbchevy

Geezer
G-Body of the Month
Aug 8, 2011
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Michigan
He must of done upgrades to it then since this has a 491 BBC with a 400 and trans brake running slicks and nitrous.
It just sold, posted less than 8 hours ago for $10,000
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Oct 14, 2008
8,846
7,820
113
Melville,Saskatchewan
The chebby 12 bolt
1675571306447.png
 
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stew86MCSS396

Greasemonkey
Aug 1, 2022
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This is in an 87' Cutlass that is for sale, just not sure what rear this is.

329046768_540705568024681_9149129209039844528_n.jpg
Is that common to run the springs forward of the axle which is original to this era rearends. I mean it wouldn't be the first time I've seen it done this way. I was thinking it should be relocated to the top of the axle tube like it would be in a g-body. Just wondering what others have done???
 

565bbchevy

Geezer
G-Body of the Month
Aug 8, 2011
9,650
12,799
113
Michigan
Is that common to run the springs forward of the axle which is original to this era rearends. I mean it wouldn't be the first time I've seen it done this way. I was thinking it should be relocated to the top of the axle tube like it would be in a g-body. Just wondering what others have done???
If it were me I would probably just fab up some Gbody style perches and relocate them to the factory position.
 
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