Your torsion bar is your spring. Instead of a leaf spring or a coil spring an IFS truck as a torsion bar. It is a long straight round bar that runs from your a-arm back along the inside of the frame. It is made of spring steel and is mounted solid at the rear, and rotates at the a-arm. The more you tension the bar the more it twists the a-arm downward. Turning your torsion bars too much will throw your alignment off. You can get away with little bit (an inch or so) any more will start to cause abnormal tire wear. You change the tension at the solid rear mount, were there is a large bolt that you can turn to adjust the solid mount.
