If you want real life experience and input, here it is. My car weighs 3726 with a half tank of gas. Add another 200+ for me. 4 speed launching at 4K and 3900+ pounds. The 8 3/4 lasted many years until I started going faster. Once I hit the low 12's is when things started to come apart. U joints, the twisting axles, then bearing retainers, then twisting housings even after back bracing. I've had my dana in now for 3 years going on 4 and have not had one breakage. I could have saved a lot of money if I would have put the Dana in years ago, but I was a bull head. An 8 3/4 will last a lot longer with a light car and an automatic. A heavy car,a stick and slicks and you are living on borrowed time.