For an economical way to run 33 in. tires on your Chevy Silverado or GMC Sierra, Zone Offroad has a 3.5" Combo kit that includes 2" front leveling torsion keys and a 1.5" body lift. Installation does not change the factory ride. Front bumper relocation maintains the factory look and this kit includes Grade 10.9 bolts. Optional rear bumper brackets ZONC9908 are sold separately.