[jayem]

I have a vibration that comes on at about 65 mph and gets worse the higher the speed. It feels like a drive-line issue. The drive line and yoke have been ballanced twice, I've had the tires and wheels checked and ballanced twice, the 9 inch rear end has been completely rebuilt. Any ideas? engine off ballance? clutch off ballance? bf goodrich tires need shaved? help!