ReadyLift 5" Rear Lift Block Kit For 2011-2022 Chevrolet/GMC 2500/3500HD 2000-2003 Ford F-550 7.3L why does it need to

why does it need to be a tough tool steel anyway

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ReadyLift 5" Rear Lift Block Kit For 2011-2022 Chevrolet/GMC 2500/3500HD 2000-2003 Ford F-550 7.3L why does it need toReadyLIFT OEM style rear block kits are available for the 2011 2022 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 2WD and 4WD 8 lug truck. Based on OEM designs and never made out of light weight extrusions our 5" GM Blocks are made from cast iron just like the factory blocks, ensuring maximum strength and reliability. ReadyLIFT