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