ReadyLift 66-2515 Leveling Kit with Track Bar Bracket for F350/F450 4WD Coil spacers provide the safest and least expensive way to lift or level your truck Installs easily in about an hour - professional install recommended Retains the OEM factory ride while lifting your vehicle up to 4 inches Guaranteed against manufacturer defects in materials and workmanship for the life of your vehicle Includes OEM style track bar relocation bracket