For as long as I can remember, one of the cooling fins on the diff has a small crack on it, don't know how it got there, but they claim that I actually hit something, which jumped the diff up and broke the bolt and destroyed the bushing. I already know what broke the bolt, too much wheel hop. The guy told me to call my insurance cause it was broken from an accident. I explained that the front bumper actually sits lower than the diff, and would have been cracked badly if I hit something, and there isn't a single scratch anywhere on the front bumper. In the end, I had the dealer in barrington fix it under warranty.