Ive been dealing with this vibration for some time now, tried about everything I can think of. It is not all the time, only vibrates half the time, and only at speeds from 62-68 roughly. For instance, it wont vibrate in the morning, and it does usually in the afternoon on the way home from work. Its so bad it shakes the passenger seat from side to side, the steering wheel shakes and the dash shakes bad. Had the tires inspected, balanced, rotated. Wheel bearings checked. New steering stabilizer. All the tie rod ends checked, most replaced. New steering gearbox. Rear end checked, rear brakes replaced, carrier bearing checked, ujoints checked. Could it be suspension, track bar (supposedly good). Im tired of this, and cant find a shop who can figure it out.