2" REAR BLOCK KIT - GM SILVERADO / SIERRA 2500 HD OEM STYLE 2011-2023QUICK OVERVIEW ReadyLIFT OEM style rear block kits are now available for the 2011 2023 GM 2500 HD single rear wheel pickups. These Rear Block Kits include two (2) 2" Rear Blocks, four (4) E Coated U Bolts, eight (8) Nuts and Washers and will safely lift the rear of your 2011 2023 2WD and 4WD 8 lug Single Rear Wheel GM trucks 2". Based on OEM designs and never made out of lightweight extrusions, our 2" GM Blocks are made from cast iron just like the