Tuff Country EZ-Ride suspension's 3.5? lift kits for the Sierra 2500HD/3500HD are an affordable lift solution that will allow for up to 35 inch tires (w/minor trimming). The replacement torsion bar keys reindex the factory torsion bars, while the new upper control arms keep the front end in proper geometry. 1? blocks and extended u-bolts raise the rear end. Also includes front shock relocation brackets, new shocks not required. Now includes re-enforced control arm eyelets, suspension limited straps and upper control arm bump stops.