I have an O.E.M. 9" 3rd-Member out of a 70's Mustang. It has original gears (FoMoCo). It has a slight whine between 40-60 mph. It comes in at 40 mph and goes away at 60 mph. It also has a clunk when you snap off the gas and clunks again when you get into it fast or rather hard. Normal driving you don't hear the clunk. My question.....Is it possible to take this O.E.M. and have it gone over (bearings, lash and etc.) and get rid of the whine and clunk? If I could get rid of the clunk..........I could live with the whine. Your thoughts..........Please!!!!