The 4" Combo Kit by Zone includes their 2" torsion bar keys plus a 2" body lift.The torsion bar keys made in the USA and are 100% resonant frequency tested to ensure a solid casting. Once tested the keys are CNC machined to ensure the proper amount of lift. The body lift includes all body mounts, front & rear bumper relocation, fuel fill extension, steering extension and spare tire relocation. The rear bumper brackets are for appearance only and the bumper cannot be used for towing. Many of these 1997-03 vehicles do not have alignment cams in them. These are necessary to properly align the vehicle and are available as an option ZONF8001. Longer shocks are optional.