I replaced mine at 65,000 miles because I was slipping it. In essence mine lasted until my 2nd BOMB. I bought the truck with 24,000 miles on it and at 28,000 miles put on an original Powermax (275 hp/660 ft/lbs), then at about 45,000 miles (guessing - don't remember for sure) I put 275 hp RV injectors and this is where I slipped the clutch a couple of times when abusing it but it would still hold after that. At 65,000 miles I decided I was going to uprate again and knew the clutch wouldn't hold so I replaced it then. I still have the clutch out in the garage and can take a picture of it if you'd like, it still looks great other than small burn marks on the pressure plate (it only slipped about 2 inches) - but other than that it looks fine. If anyone wants it you can have it cheap, btw because I don't have any use for it anymore. I got an email recently from a friend of a friend that put 300,000 miles on his stock clutch at stock power before he started uprating, he changed it at that point and it still looked great he said.