drive shaft thump, they warrentied the fix for me. I've got 101,000 miles I love this truck the only thing I've replace that wasn't normal maintance was at 99,000 mile I had to replace my 2 front rotors, I couldn't believe they don't have the tools to rebuild them. When I was a auto tech we rebuit everything even water pumps on Caddies and relined brake shoes, all these guys do today is replace parts.