Hi Nate,
The Ford 8.8 rear axle (with disc brakes)is used from 95-00, but is basicly the same as the pre95's.
The only differance is the Disc brakes.
The main differance between the 95-97 IFS and 98-00 IFS is the back portion of the torsion bar mechanism, and the cross-member on the 95-97 is welded, where as the 98-00 is bolted. Is this what you were looking for?