The Tuff Country 2.5" front leaf pack uses 4 or 5 small leafs that mount to the front leaf springs using the included new u-bolts. This design provides most of the lift height from the thickness of the leaf pack rather than re-arching the stock springs. The benefit is a level Ford F250, F350 Super Duty with a near-factory ride. Also included is a front track bar relocating bracket to maintain proper alignment and all necessary hardware for installation. It is strongly recommended that 2000-04 F250, F350 models equipped with a 3/4" diameter track bar should replace it with a 1" track bar. Tuff Country offers a 1" replacement track bar #20950 .