Heavy Duty Lower Control Arms, 2.75-Perfect Steerable Transfer Carth longer than stock (5.50-Perfect Steerable Transfer Carth track width Perfect Steerable Transfer Cartrease) Heavy Duty Double-sheer Upper Control Arms with adjustable caster; Heavy Duty Double-sheer Knuckles with unique geometry only compatible with a MarRack. Not compatible with factory racks or narrowed Tundra racks; Not compatible with sway bars or K.D.S.S.