1 TON. Left.2WD. Right.2WD. 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.