I have been in search of a posi disc brake rear for my 89 firebird. I have found a posi rear but it is not disc brake equipped. I found a 98 firebird with an open, disc brake rear and was wondering if anyone had tried to bolt the 4th gen calipers, brackets, and rotors on to a 3rd gen rear end. Any response would be a great help.

 

yea you can mount 4th gen rear disk brakes ont a 3rd gen rear. Only thing though is that you have to redrill and grind down the part no the rear end. Then after that I think all you need is a custom mounting bracket. And the rest should just go on.

 

I am guessing that 4Th gen rear disk brake will bolt onto third gen 10 bolt rear end but not 3Rd gen 9 bolt rear end.