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Old April 20th, 2011, 10:10 AM   #1
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Posi rear end

looking for a decent used posi rear end with gears ranging in size from 3:73 to 3:08. This will be for my 1972 cutlass. 10 or 12 bolt doesnt matter...just want axle to stay the same width so prefer type O

Thanks!
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Old April 21st, 2011, 06:09 AM   #2
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I have a 3;23 posi - 10 bolt rearend out of a 71-72 A body , it is the bolt in style o- axle set up . Ready for install , it is backing plate to backing plate . E-mail me if you need more info . It has been refurbished . BOB
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Old April 21st, 2011, 07:46 AM   #3
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If u get a type O they are hard to find in a posi and hard to find parts for. if ur car is a 72 cutlass then u can do a 70-72 chevelle skylark not for sure but i think nova gt lemans. there are probably more. they are all the same width and bolt ins. the 10 bolt 8.5 parts are everywhere and good priced.
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Old April 21st, 2011, 07:57 AM   #4
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alek72us - only the 'A' body rears will fit, Chevelle, Le Mans, and Special.
Athough close in width, gt[?] and Nova have leaf springs, and won't work.
If I were to change the whole housing, I'd go for a 12-bolt, as the xtra $'s would be worth the xtra strength, to me!
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Old April 21st, 2011, 08:18 AM   #5
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but the 12 bolt type O is the same as 8.5 inner as the 10 bolt. so its not much better strength if u want the 12 bolt strength u need the 12 bolt chevy rear end. which is the chevelle.
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Old April 21st, 2011, 08:39 AM   #6
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Sorry - to me, a 12 bolt is ONLY a Chevy!
Yes, the Chevelle is the only one to work in a Cutlass 4-link, and the early 64-67 housings are 2 inches narrower - can help tire clearance!
The type 'O' or 'P' are usually refered to as a 10 bolt 12 bolt, ie: 10 bolt gears in a 12 bolt housing!
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Old April 21st, 2011, 08:45 AM   #7
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u r ok we just need to clearify better for the ones asking the ? so we don't confuse then more then they need to be.

yes if u need x-tra strenth the 12 bolt chevy would be best. the type O i would get if i was doing a stock/stock build. but the 10 bolt 8.5 is cheap/available/u can also make the strong.
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Old April 22nd, 2011, 05:32 AM   #8
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The 12-bolt O-axle does have an 8.5" 10-bolt ring gear,but those internals are unique to themselves.You can NOT install the 71-up 8.5" 10-bolt guts into the 12-bolt O-axle housing.

Deedsntitles,
I can sell you a completely rebuilt 71-72 8.5" 10-bolt posi rear,any gear ratio,for $975.00 plus the freight.Everything inside is new.This is the same style rear that came in the 71-72 Cutlass/442,and the 71-72 Skylark/GS.These are good rears,and will handle plenty of power.
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Old May 8th, 2011, 08:38 PM   #9
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Rick,

507olds aka Trick is very knowledgeable about the Cutlass game and expecially those rear ends. We have dealt with him before and I can say he is a standup guy....
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Old May 8th, 2011, 08:38 PM
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