Dont know for a fact but car started making noise and i wasnt taking ne chances with it..its been parked for over a week now bc i havent had time 2 take it in working 50+hr work weeks...talk 2 a local guy and he says the noise is my pinion bearing. GREAT. had my 3.73's done like a year & 1/2 ago with new bearings...is it from me beating on it? or the guy who installed them?:nono: