Hotchkis Sport Suspension 1804A for 1964-1967 GM® A-Body Adjustable Rear Suspension Package. Hotchkis Sport Suspension adjustable upper and lower trailing arms for your 1964-1967 GM® A-Body work together to positively locate and control the rear axle. Launches are quicker smoother and more consistent by reducing wheel hop. The adjustable upper control arms allow for easy pinion angle changes to better tune your vehicle. Handling and overall stability are dramatically improved through increased roll stiffness and sway bar effectiveness. The fabricated trailing arms are constructed from one piece of .120 in. wall TIG-welded steel tubing making them the strongest in the industry and include greasable polyurethane bushings. Trailing arm mount braces and hardware are also included. This item is a must for any high horsepower Chevelle®, GTO®, El Camino® or and other A-Body models.