I have a guy wanting to sell me a posi disc brake rear end, complete with 3.42 gears, said it came out of a trans am..this will fit for my 89 trans am wont it? I have to get a posi rear..cant stand these slow track times with the highway gears I have now..I think they're 2.73.

 

yeah, it'll fit...but do you have disc brakes right now? if not, there is more to it than just swapping the axle assembly..

Brian

 

no its drum brakes on the car now..

 

Depends on WHAT Trans Am it came out of.

If it's a 82-92, then yes it will fit, and all you'll have to worry about is the brake issues. Some disc brake systems require a different master cyl and/or proprtioning valve.

If it's a 81 or earlier rear, then it will NOT fit your car.

If it's a 93-up rear, then it will almost fit; it will bolt in, but will be about 1-5/8" too long on each side, which will prevent your stock wheels from working right. You'll need wheels with the correct offset for 93-up cars. Plus, a few brake issues, as above.