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Hotchkis Sport Suspension has adjustable upper and lower trailing arms for your 964-1967 GM A Body that work together to positively locate and control the rear axle. The launches are quicker, smoother and more consistent by reducing wheel hop. The adjustable upper control arms arms allow for easy pinion angle changes to better tune your vehicle. Cornering 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 inch wall TIG welded steel tubing making them the stongest in the industry and include greasable polyurethane bushings. The trailing arm mount braces and hardware are also included. This item is a must for any high horesepower Chevelle, GTO, El Camino or other A-Body models. For easy bushing installation, they also recommend the GM Upper Trailing Arm Bushing Installation and Removal Tool.