I just got an 82 trans am with rear disk and am told probly has 3.23 posi in it.which of these rear ends would be best to have in my 89 iroc with 350tpi.and whats the pro's and cons between limited slip and posi

 

There isn't enough difference between 3.27 and 3.23 gears to worry about. Posi and Limited Slip are different terms for the same thing. 3.2x gears will give better acceleration from a stop, but you'll lose top end and potentially fuel economy.

I wouldn't swap a 10 bolt from a 82 Trans Am into anything newer, even if it had better gears. Early disc brakes suck, and it'd have 26 spline axles. Your 89 probably has a 9 bolt, which some would consider a much better rear to start with.

 

And if the 82 has a limited slip, it's probably the dreaded Gov-Lock. All in all not a rear, I'd chose.

JamesC

 

THANKS guys,I'll leave it in the 82 and keep my 2.73.I probly wont be doing much racing with it anyhow.

 

Gov-locks were only put in trucks from the factory

 

save up and get a good aftermarket rear end. You won't regret it. I put enough money into one of my ten bolts that by the time i got it running correctly I could have bought a complete nine inch.

 

My 82-85 F-Body Parts and Illustration Cat. shows it. A search will provide several pages of info on the "Gov lock."

JamesC