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Ready Lift 1" 2" 4" 5" Rear Block Kit - GM/Chevy 2500/3500HD 2011-2024+ Trucks Choose your Block & U-Bolt:[1"] 3500HD [W/ Overload Spring] You do not want aGM 2500HD 3500HD OEM Style 1 5" Rear Lift Block Kit Fits 2011 2026+ GM HD trucks. Includes new longer U bolts and hardware OEM style cast iron construction. These Rear Block Kits include two (2) 1 or 2" Rear Blocks, Four (4) E Coated U Bolts, Eight (8) Nuts and Washers and will safely lift the rear of your 2011 2024+ 2WD and 4WD 8 lug Single Dual Rear Wheel GM trucks 1 or 2". Based on OEM designs and never made out of light weight extrusions, our 1 or