When buying gears (new or used), make sure you order them for a '91-96 B-body. There is an ABS reluctor ring pressed onto a shoulder on the pinion gear, and no other versions of the 8.5 have it. In addition, you'll have to get the right reluctor that matches your gearset, otherwise your ABS system will not function. For 3.73s, use GM PN 26018946. We found it at our local dealer for about $30.