ReadyLift 69-3485 4.0" Front/1.75" Rear SST Lift Kit for Chevrolet Silverado/Sierra 1500, 2007-2010 At the heart of the system is our all-new 100 percent DOM tubular upper control arm Includes 3 inch OEM-style cast iron rear lift blocks and u-bolts; rear lift blocks have the correct pinion angle correction and axle locating ears for perfect fit and performance and replaces the factory 1.25 inch rear block Completing this great new lift system are a set of steel rear shock extensions; no need to replace your great-riding factory rear shocks with inferior aftermarket shocks