1/2 TON. Left.4WD. Right.4WD. Torsion bar adjust bolt. 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.