orginally my car was stock w/ a 1988 2.8L V6 and 3.42 rear end. it now has a 5.7L V8 w/ the same rear end but I want to put in a posi. I've read that some things changed in '88 for GM rear ends and wasn't sure what would or wouldn't work. After lookin around and readin this is what I found....a 3.73 Eaton Posi Unit 7.625" 10 bolt GM 28 Spline..... and I know that Auburn has the same thing. Would this work in my '88 bird? thanks,
-Drew

 

edit: no point posting if you aren't going to believe me, i'll try not to confuse you in the furure by replying to your questions.

 

yours has 26 splines axles. you will need to get 28 splines to work the that carrier. Or buy a posi for 26 spline axles. gears are the same...

 

can you tell me where i can find information that verifies what you guys told me?

 

http://www.uspowertrain.com/axlesGM.htm This is a link to a chart with gm axles....should be all the info you need

 

hey sorry man. i didn't mean to insult you. i've just been lookin around for that info for a while and was hopin you could show me where i could get ahold of it.
-drew