my wife has a 2002 v6 camaro it has a vibration feels like its coming from the rear end and i can not find the problem. I have had three different sets of tires on it new brakes rotors dont feel a change in the thing. I get only get it at 50+ mph, i checked the u joints they feel good dont know where else to turn please help

 

check to see if the drive shaft is still in balance.

 

Shocks???????? Tranny mount?????? Did she accidently hit a curb????