ReadyLIFT Made To Fit OEM style rear block kits are now available for 2011-2014 Ford 4WD Super Duty F350/F450 Dually and F250 with Dually Rear Springs. These new 5.0" Rear Block Kits include (2) Rear OEM style 5.0" tall Rear Lift Blocks, (4) extended length E-Coated U-Bolts designed specifially for the large dually rear spring pack and (8) Nuts and Washers. This kit will safely lift the rear of your 2011-2014 Ford F350/F450 Super Duty Dually 4wd Truck 3.0" in the rear. Lifts F250 Super Duty 4WD with OEM Dually Rear Leaf Spring Pack an additional 1.0-2.0"�. Based on OEM designs and never made out of light weight extrusions our 5"� 2011-2013 Ford Super Duty Dually Spring Pack 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!. 1+ hour installation time. Note: Fits Dual Rear Wheel Trucks ONLY or Super Duty Truck equipped with OEM Dually Rear Spring Pack Your truck must be a dually or have dually rear spring pack to use this kit. Lifts 2011-2014 Ford F350/F450 Super Duty Dually 4wd Truck 3.0" in the rear. Lifts 2011-2014 F250 Super Duty 4WD with OEM Dually Rear Leaf Spring Pack an additional 1.0-2.0"�. Kit includes 2011-2014 Ford F250 model specific new OEM style rear lift blocks and new 2011-2014 model specific u-bolts. This product ships in approximately 1 days