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7.5" gm 10 bolt?????

3K views 6 replies 6 participants last post by  LoudMalibu 
#1 ·
is it worth it and actually possible to install limited slip set up and steep gears in my 7.5" rear end. it is the stock rear end from my 81 pontiac. what are other stouter rear ends that can be had and installed for cheap? thanks for your help
 
#2 ·
Don't know if it;s still the same but Pontiac used
to make two axle housings, high gear ratio 2:56
to maybe 3:08 you can not put any other gears in this housing like 3:55, won"t fit. If you have say 3:73 limited slip you would need housing from
3:23 thru 4:11 and the same was true if wanting to go from low gears to high gears. Was easier to find complete axle assy, already set up than to switch gears to radically(low to high, high to low).I got my 3:55 limited slip for 75.00 complete.Don"t know your location but wrecking yards, pull and saves are great scorces of cost effective upgrades.again this is how Pontiac used
to be, don't know for sure now
 
#4 ·
Call the manufacturers of limites slip units. Eaton, Powertrax etc. and ask them. They know. However, the 7.5 and 7.75 rears are notoriously weak at the ring and pinion. If you are going to change, at least go to a 10 bolt and if you have a lot of power, a 12 bolt. Chevy still makes 7.5 rears in S-10's that are posi units. They are nearly give aways at the junk yard now.
 
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