Hotchkis 73-77 GM A-Body Double Adjustable Trailing ArmsHotchkis Sport Suspension 1206AA 1973 1977 GM A Body Double Adjustable Upper Trailing Arms. Improve the traction and handling of your GM 73 77 GM A Body Muscle Cars with the Hotchkis Double Adjustable Upper Trailing Arms. These exceptionally durable arms allow for easy pinion angle adjustment for reduced vibration and increased traction. Our exclusive Swivel Max bushings offer non binding articulation during suspension travel which improves traction