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looking for a rear end 77 grand lemans
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doug7
New User
| Posts: 5
| Joined: 05/08
Posted: 07/21/09
04:03 PM
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Hi Guy's
I'm looking for some help, I want to change my rear end out of my 77 grand lemans for one that already has a posi and 3:43 gears if you know of any out there or what other cars would be compatable to help narrow my search that would be great thanks for your time
Doug 
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68scott385
Enthusiast
| Posts: 314
| Joined: 05/09
Posted: 07/22/09
02:44 PM
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the only rearends that will bolt in without modifications are 73-77 A-bodies
if you can find a rearend from a 73-74 laguna, 442, big block monte carlo, or similar performance offering from the earlier years of this body run would be your best bet
during the mid-seventies was when lower compression, higher milage requirements, and unleaded gasoline was forced onto the public
the general tried to keep some performance in the lineup but it was mostly dead by 1975
oh...GM did come out with HEI for the '75 model year
it might be just as cost effective to have your existing rearend upgraded, or to have a 10 or 12 bolt built for your application,...there are companies that advertise in CC that offer those rearends...chevy rearends are going to have "C" clips while some others use bolt in axles
in my area the junk yards have gotten rid of nearly all the donors for these body years (the left turn guys didn't help either as these were perfect for figure eight racing) and the later A/G's are getting scarce too
happy hunting
-
the red-headed step-child of the mailing list
fuzzy dice, air shocks & N50's rule
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doug7
New User
| Posts: 5
| Joined: 05/08
Posted: 07/22/09
04:28 PM
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Thankyou for the info that will help alot.
Thanks Doug
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Posted: 08/24/09
06:03 PM
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i am in the same boat looking for a posi for my 72 lemans
any help on what will interchange with this would be great
thanks
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68scott385
Enthusiast
| Posts: 314
| Joined: 05/09
Posted: 08/24/09
06:39 PM
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if you're looking to change rearends, '68-'72 models of the same body family will swap right in...i've heard that '78-'86 A/G rearends are the same width (flange to flange) but not sure if the mounts are spaced the same
if it's just a posi unit that you want, it might be more cost effective to get an after-market posi unit and install it into your current housing
i personally put a powertrax unit in my current 10-bolt...they replace the spider gears and don't require pulling the carrier out...i like it so far but don't have much time/miles on it
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the red-headed step-child of the mailing list
fuzzy dice, air shocks & N50's rule
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