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Old 08-06-2004, 12:57 PM   #1 (permalink)
<72S>
 
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Question

Would an 8.5 10 Bolt from a G-Body (1984) work in a 1972 Cutlass A-Body? I understand that the '72 has a 10 Bolt (8.5?), but it's a 3:08 open diff. The 8.5 is a 3.73 Posi. Could I swap the G-body rear into the A-body?
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Old 05-21-2007, 08:28 PM   #2 (permalink)
GoldOlds
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I could be wrong here, but I think most G-body ('78 to '88 Cutlass, Monte, Grand Prix, Regal, Malibu, etc.) rears have 7.5" rear ends, not 8.5". The 7.5" is the weakest rear end GM ever made. The only G bodies that had the 8.5" rear were the 442s and Grand Nationals/Turbo Regals.
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Old 05-22-2007, 09:45 AM   #3 (permalink)
joe_padavano
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While there are a few 8.5 inch axles under G-body 442s and Turbo Buicks, almost all came with the 7.5 inch axle that was originally born under the Vega. More importantly, the G-body axle is about 3 inches narrower than an A-body axle AND the control arms are at a different angle. You can physically force them into place but the suspension will bind up if you try to drive it.
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Old 05-22-2007, 11:16 AM   #4 (permalink)
GoldOlds
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Quote:
Originally Posted by joe_padavano View Post
the 7.5 inch axle that was originally born under the Vega.
That's exactly where those P.O.S. rears belong! Too bad the G-bodies didn't ALL come with the 8.5" rear - otherwise, they're great cars.

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Old 09-13-2007, 09:06 PM   #5 (permalink)
monzaz
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8.5 rear

What I could never figure is how camaro and trans ams got totally left out of the 8.5 loop??? That was weird. JUST a thought. Jim
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