This rear end came out of a 2000 Pontiac Trans Am that was being built for drag racing. It fit under this car great. Just to clarify, 1993 was the last year the 9 bolt came in the f-body. This must have been swapped into this car since it is stronger than a 10 bolt
4th gens had 10 bolts.. 9 bolts were used until the end of 89..Some early 90's squeezed through using the last of the inventory.Nothing special about that rear. There were TONS of them produced...Its also a pre-89 rear with iron calipers