Quote Originally Posted by ilbcnu123 View Post
could be a driveshaft or something along the drivetrain. Put the car in gear without an e-brake and rock it back and forth to see if there is a lot of play/clunking. In my car, the driveshaft has a carrier bearing and if that goes bad, it will cause vibrations.
driveshaft is dependent on speed not engine rpm or which gear.