Why your Ford Super Duty has the Death Wobble
The stock track bar setup on the Ford Super Duty trucks, is a bar mounted in single shear to a ball joint at the axle and a rubber bushing at the frame. The stock bar is offset from the center of the ball joint at the axle. This applies un-wanted torque and deflection on the joint and the rod. The rubber bushings at the frame mount is another source of un-wanted deflection. As the ball joint and rubber bushings wear, deflection increases. When deflection occurs the track bar loses its ability to keep the axle in position laterally under the truck. The wobble or shimmy you feel from the steering wheel is actually the steering linkage being forced to control the axle and wheels, as the trac bar deflects.
