Created for Super Stock classes designed to relocate the rear of the leaf springs inboard 4 for additional tire clearanceAn 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 fender wellAllows you to accommodate a 13-14 racing slickOEM gas tank needs to be narrowed 2 or use a fuel cellTwo per package