#1  
Old 08-17-2023, 07:45 PM
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Arrow Wanted - A-body 8.5" Rear (Ď71-Ď72 Buick/Olds) local pickup in So Cal Only

Looking for a good used 8.5" 10-bolt rear axle assembly in working condition or even just a bare housing with or without axles. I have a 2.73 gear set and posi unit I want to install in it.

Must be from a '71-'72 Buick or Olds A-body with bolt-in axles (no C-clips) equipped with A9 tapered axle bearings.

Must be located in or near the So Cal/Los Angeles/San Diego area so I can pick it up, I'm not interested in paying to ship one of these.

If you have one of these and happen to be heading to So Cal for any reason I can meet you somewhere in So Cal that’s convenient for you and pick it up.

Please send me a PM if you have one for sale, thanks.

  #2  
Old 10-19-2023, 02:40 PM
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Still looking.

  #3  
Old 02-12-2024, 12:36 AM
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Still need one in So Cal.

  #4  
Old 05-23-2024, 04:34 PM
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Looking……

  #5  
Old 05-29-2024, 01:23 PM
6d7gto 6d7gto is offline
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Quote:
Originally Posted by b-man View Post
Looking for a good used 8.5" 10-bolt rear axle assembly in working condition or even just a bare housing with or without axles. I have a 2.73 gear set and posi unit I want to install in it.

Must be from a '71-'72 Buick or Olds A-body with bolt-in axles (no C-clips) equipped with A9 tapered axle bearings.

Must be located in or near the So Cal/Los Angeles/San Diego area so I can pick it up, I'm not interested in paying to ship one of these.

If you have one of these and happen to be heading to So Cal for any reason I can meet you somewhere in So Cal thatís convenient for you and pick it up.

Please send me a PM if you have one for sale, thanks.
Did you try Frank's?

https://www.frankspontiacparts.com/e...nsionparts.htm

  #6  
Old 06-03-2024, 10:37 PM
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Default 8.5 buick

https://inlandempire.craigslist.org/...744542902.html I'm not sure if this close to you?

  #7  
Old 06-03-2024, 11:49 PM
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Franks doesn’t sell Olds or Buick part’s so that’s a no go.

I’m not looking for a complete rear end set up for racing with a spool and 3.73 gears and listed as rare so as to imply it’s worth a lot of money. Definitely close enough to me but again exactly what I don’t need.

Thank you for your help but still looking for something stock and fairly complete or a bare housing to put my 2.73 gears and factory posi into.

  #8  
Old 06-04-2024, 12:09 AM
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https://sandiego.craigslist.org/csd/...753418380.html

  #9  
Old 06-04-2024, 12:16 AM
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Quote:
Originally Posted by post toastie View Post
Appears to be a Pontiac 8.2 from looking at the bracket that holds the brake line T fitting that’s attached to the top cover bolt. The 8.5 Buick/Olds rears aren’t like that, the T fitting bolts directly to the top of the housing without a bracket.

The second picture is the Buick/Olds 8.5 I have in my Tempest, note the T fitting bolts directly to the top of the housing.

Thanks again.
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  #10  
Old 06-04-2024, 12:34 AM
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It's been awhile since I have seen an a body 8.5 for a 71-72 buick . A friend of mine has one in his 68 tempest.
In my 72 pontiac manual for a and g body doesn't list a 2:73 gear or an 8.5 differential for the 10 bolt maybe its an Olds good luck


Last edited by post toastie; 06-04-2024 at 12:54 AM. Reason: spelling
  #11  
Old 06-04-2024, 12:36 AM
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The 8.2 would have come with a 2.78.

Corporate 8.5 had the 2.73.

The ad saying it has a 2.73 gear is almost certainly inaccurate. Note the cover has no indications it’s ever been removed to inspect the gears. If you’re simply turning the pinion yoke and counting the the turns to determine the ratio how could you tell if it’s a 2.73 or 2.78 ?

You can’t.

  #12  
Old 06-15-2024, 03:08 PM
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http://jdrace.com/content/diff_id/10b85.php good info.

  #13  
Old 06-15-2024, 03:13 PM
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I already have purchased one about 15 years back from JD Race and Iím very happy with it.

Shipping back then was $200, Iím sure itís at least double that now so Iím looking locally.

Once I procure the rear end housing and stock 28-spline axles Iíll have a local shop install my 2.73 ring and pinion and posi unit.

  #14  
Old 06-18-2024, 11:40 AM
'ol Pinion head 'ol Pinion head is offline
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My suggestion is ck the local Olds & Buick A-body guys that restore Cutlasses & buy partscars. The A9 axle bearing version housing with the square lugs are out there. Nearly a million were built of the most common style '71-72 housing (with the square lugs).

2 out 3 times, the factory gear ratio will be 2.73. If the ring & pinion are in nice shape, much easier to install a posi unit/recreating same backlash, than properly installing another gear set.

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  #15  
Old 07-11-2024, 09:08 AM
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Quote:
Originally Posted by 'ol Pinion head View Post
My suggestion is ck the local Olds & Buick A-body guys that restore Cutlasses & buy partscars. The A9 axle bearing version housing with the square lugs are out there. Nearly a million were built of the most common style '71-72 housing (with the square lugs).
Look up Hector Carrillo, he is one of those guys. Also has a side business rebuilding steering boxes. He is in "Inland Empire" to best of belief. One of his avatars is "carhex".

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