Team Z Motorsports offers a Upper Torque Box Replacement Kit to replace your old worn out or damaged torque boxes on your 1978-1987 GM G-Body vehicle. If you are looking for super strength and lower 60-foot times, our unique indexing design allows for micro fine adjustment of 0.125, unlike anything else on the market. Kit is constructed using lightweight 4130 Chromoly steel, TIG Welded, and assembled in house. Designed to work with our Team Z Street Series Double Adjustable Upper Control Arms. Strongly recommend tying into roll cage. Proudly made in Detroit Michigan.