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Old 06-16-2003, 08:48 AM
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Good rearends for 71 Chevelle

Is there any rear ends that i can find in the junk yard with something like 3:73 gears or little higher and same bolt pattern that is on my Chevelle and will bolt up like the original one would? If so what is the Make/Model?
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Old 06-21-2003, 05:56 PM
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'64-'72 Chevelle 10 and 12 bolts. '64-'72 Buick/Olds/Pontiac 8.25" 10 bolt ( different from the Chevy 8.2" ) and I have discovered that some '72 Olds Cutlass S and 4-4-2's came with the 8.5" 10 bolt. All those would be a bolt in with the exception of U-joints, BOP's used a different U-joint but at one time TRW made a conversion U-joint. I'd try to fing the 8.5", they are still plentiful and many, many Trans Ams came equipped with that rear in 3.42 or 3.73 gears. Find the Olds housing and axles and then a TA with a posi and the gears you want. Avoid 12 bolts out of '69-'70 Oldsmobiles. They are actually oddball 10 bolts with a 12 bolt inspection cover. They were strong enough but were getting hard to find parts for by the late 70's.
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Old 06-21-2003, 09:03 PM
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Thank you for replying, Another question- Wich one of those are positive traction..?
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Old 06-22-2003, 07:08 AM
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You'll just have to check them, they were all available with posi. The BOP's seemed to have posi more often than the Chevy's but check every one you see. I have found posi's under some of the most unlikely vehicles... Ya' just never know. Performance oriented modesl are most likely to have it followed by El Caminos and wagons, especially if you see signs of a hitch on it. People that pulled boats often ordered posi. Up here it was more common because of the snow also. I found a posi under a '64 Impala Sport Coupe with a 327, PG and factory AC, PS and PB. I have been under scores of identical cars that had open rear ends and expected this one to be no different. Much to my surprise and delight it had a factory 3.36 posi. A good friend found a posi under a six cylinder Biscayne once !
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Old 06-22-2003, 07:14 AM
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The newer 8.5 rear ends , where the upper and lower control arms bolt on , the brackets on the rear end are spaced different. the 10 bolt 8.2 and the 12 bolt are getting harder too find ,if you want posi trac try looking for el camino's there were supposed to all have posi trac's. as far as 12 bolts go there is alot of aftermarket parts for them, such as gears , posi trac's, or there is aftermarket 9" ford rear ends built for many older GM's that will bolt directlly in.
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Old 06-22-2003, 08:34 PM
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Quote:
Originally posted by dklong
if you want posi trac try looking for el camino's there were supposed to all have posi trac's.
Unfortunately not all El Caminos had posi but many of them did so don't pass one by without checking it out.
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