I know there's got to be other guys out there that have been here before. The damn thing vibrates only while in drive, rooling with the foot on the gass, let off the gas, vibration stops. I've changed all u-joints and run in 2 wheel drive 95% of the time. My ideas are this= if it was tire ballance, it would vibrate all the time weather or not foot on gas. if it were motor mounts it would bibrate during a brake tork, which it doesn't. same with trans mount. the engine does have a miss in it I think due to valves, but the vibration is everywhere. in the seat the dash the steering wheel. Can I pop the rear driveshaft off and run it in 4wd to determine a bent driveshaft or orther rear related drive problem? Please any suggestions are welcome, I can't take it much longer!!! thanks.