ReadyLIFT Suspension offers a suspension product line designed for the 2011-2016 Ford Super Duty (with dually rear spring pack) equipped with diesel engines. The 2011-2016 F250 4WD 3.5"F/3.0"R SST Lift Kit provides precise front and rear lift accommodating wheel and tire combinations up to 35" while preserving the smooth OEM ride and drivability. The kit includes 3.5" powder-coated steel coil spring spacers sound isolators shock extensions sway bar frame mount spacers bump stop extensions carrier bearing spacer track bar relocation bracket radius arm drop brackets and OEM-style 5.0" Rear Lift Blocks with longer u-bolts for the dually rear spring pack. This system enhances the vehicle's appearance while retaining factory ride quality. It's tailored for the 2011-2016 Ford F250 4WD with dually rear springs and maintains OEM ride and sound quality with 3.5" coil spacers and sound isolators. Shock extensions enable the use of existing front shocks. Radius arm drop brackets and a track bar relocation bracket maintain suspension geometry. Sway bar mount spacers are included to level the truck. Bump stop extensions preserve the factory distance between the bump stop and axle and a carrier bearing spacer allows driveshaft angle adjustment. The use of cast iron 5.0" rear lift blocks (3.0" lift) creates a lifted stance with a 0.75" rake. ReadyLIFT's 3.5" SST Lift Kit is an easy safe way to lift your Super Duty without compromising the factory ride. It features Smart Suspension Technology ensuring a hassle-free installation with no cutting or drilling required. The kit is backed by a lifetime warranty against manufacturing defects. Please note that it is not compatible with the 2011-2016 Super Duty with the 6.2-liter gas engine and aftermarket or factory add-on air spring/load leveling kits that attach to the bump stop tangs are not supported as they can void block warranties and cause block bump stop tang failure.