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Tuff Country suspension lifts are designed to effectively add additional height to your vehicle and to increase fender clearance, allowing larger tires. These Tuff Country Suspension Lifts for the 2007-2013 Silverado/Sierra 1500HD/ 2500HD/ 3500HD reindexes factory torsion bars without cranking up. Their new upper control arms keep proper alignment. These suspension lifts feature bolt-on installation, no drilling required. Fit up to 35-inch tires w/minor trimming. Tuff Country suspension lifts are proudly made in the USA and backed by a limited lifetime warranty.