well i ran a 12.9 @ 108 on my first pass last friday, to bad i blew something in the rear end!!!!!! when i turned at the end of the lanes i heard a loud clunk in the rear end.it makes noise when i turn the car so i think it is in my auburn pro posi??????? it made the 20 mile ride home. any suggestions before i tear into it??????? would i be better off with a zexal tosion posi ??????? i cant afford a 12 bolt so that is no !!! john