Astro Pneumatic 78823 Late Model GM Heavy Duty Torsion Bar Unloader 2011+ DescriptionThe Astro Pneumatic 78823 Late Model GM Heavy Duty Torsion Bar Unloader 2011+ features a forged alloy design with 1” hex drive bolt. Needed to service torsion arm and front suspension on many 2011 and newer full-size GM trucks. The larger c-frame opening on the Astro Pneumatic 78823 Late Model GM Heavy Duty Torsion Bar Unloader 2011+ accommodates the larger torsion bar on these trucks, holding it in place while you loosen or tighten the adjusting nut.