1/2 TON. Left.4WD. Lower ball joint adjust bolt. Right.4WD. A threaded rod with a drive head (such as hex, 12 point, torx, etc.) on one end used to secure the Torsion Bar Adjusting Arm to it's mounting point. A threaded rod with a drive head (such as hex, 12 point, torx, etc.) on one end used to secure the Torsion Bar to a mounting point. Ball joint. Ing. Pivot. Torque.