ReadyLIFT OEM-style rear block kits are now available for 2017-2021 Ford Super Duty F350/F450 DRW model specific applications. These 4.0 Inch fabricated steel Rear Block Kits include two (2) rear blocks, billet drive line spacer, four (4) long e-coated u-bolts and eight (8) nuts and washers. Based on OEM designs and never made out of light weight extrusions, our 4 Inch 2017-2021 Ford Super Duty Tapered Rear Blocks have Integrated OEM style bump stops. 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. In fact, these blocks are the ideal Tow Package upgrade for not only for stock height vehicles but lifted or leveled trucks too.