4th gen rear end with posi (Auburn) differential. 3.73 gears. It has lower control arm relocation brackets for lowered cars but it looks like a couple of welds could be ground off to remove them if your car is stock height. I was going to use this in a 3rd gen car but decided to keep the 3rd gen rear (the 4th gen rear is slightly wider which requires 4th gen style wheels). Send me an email and I will get back with you.