Rear Block & U-Bolt Kit 2 Inch 01-10 Chevy Silverado/GMC Sierra 2500HD 4WD Tuff CountryTuff Country P N 97022 block kit includes lift blocks and u bolts designed to raise the rear of your GM Truck. Installation is done by inserting the cast lift blocks between the factory rear leaf springs and axle. Extended zinc plated rear u bolts designed specifically for the GM Truck are used to replace the factory u bolts. Details: Rear Block and U Bolt Kit Lifts the rear of your vehicle 2 inches Maintains a factory ride Custom made for the