Created for Super Stock classes, designed to relocate the rear of the leaf springs inboard 4" for additional tire clearance. An additional 2-1/2" of tire clearance can be had by relocating the front of the leaf springs inboard and modifying both the axle mounting pads and the inner fenderwell. This allows you to accomodate a 13"-14" racing slick. Factory fuel tank needs to be narrowed 2", or the use a fuel cell will be required. Some welding required. Not for use with weld-in frame connectors.