The OTC 7832 is required to safely release the tension on the front suspension torsion bar to service the front suspension. It has a larger design to cover the newer GM Truck applications. Application: 2011 and newer HD C/K Trucks. When servicing the lower control arm of the front suspension on GM trucks, or replacing a torsion bar, it is necessary to remove the spring pressure from the suspension. In order to do this, a clamp, called a torsion bar unloader, can be positioned on the frame and the torsion bar mount. The drive screw of the torsion bar unloader is tightened, removing pressure on the torsion bar mount. The mount can then be removed along with the torsion bar.