ReadyLIFT OEM-style rear block kits are available for the 2011-2023 GM 2500HD/3500HD trucks. These Rear Block Kits include two (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 truck. Based on OEM designs and never made out of light weight extrusions these 4" GM Blocks are made from cast iron just like the factory blocks ensuring maximum strength and reliability. ReadyLIFT Block Kits will put a slight rake back in your truck for hauling or towing and are designed to work with your ReadyLIFT Suspension Leveling Kit. Like all ReadyLIFT products these block kits come with our Lifetime Warranty. Longer shocks will be required if you do not currently already have longer rear shocks.