ReadyLift suspension Inc. Has engineered a 3.5" Lift kit made To fit the 2017 Ford F250/F350 Super Duty 4WD trucks with a two-piece drive shaft. This new 3.5" Lift kits allows for wheel and tire combinations up to 37" While keeping the smooth OEM ride and drivability. This is a complete lift kit includes 4" Oem equivalent rear blocks with integrated bump stop landings with a flat configuration for two-piece drive shaft trucks. Also features 3.5" Coil spring extensions with sound isolators, an OEM Style pan hard Drop bracket, Front bump stops, OEM shock extension brackets, A pair of radius arm drop brackets and all needed hardware. When used with the maximum size tires, The F250 truck body is raised over 6". For use with trucks with a two-piece drive shaft. Readylift's new 3.5" Sst Lift Kit system for the 2017-up Ford F250/F350 4WD Super Duty trucks is a safe, easy way to lift your Super Duty while maintaining your factory ride. This system is completely bolt on and easy to install. ReadyLift smart suspension Technology is used to make this kit very user friendly to install, requiring no cutting or drilling. Professional installation time is estimated at four to five hours. Like all other ReadyLift kits, The F250/F350 3.5" Sst Lift Kit is guaranteed for life against manufacturing defects. Front lift equals 3.5". Rear lift for F250 equals 1.0". Popular wheel and tire sizes used for this vehicle include the stock rims (17x8, 6.5" Backspacing) with 37x12. 5 tires, 20x9. 5 rims (+25" Backspacing) with 37x12. 5 tires, and 22x9. 5 rims (+25 backspacing) with 37x12. 5 tires. For information about tire and wheel sizes please visit the ReadyLift tire Sizing and Calculator Page. Note: Fits Single Rear wheel Trucks ONLY--Not Dual Rear Wheels Features & Benefits: keeps your factory ride - Guaranteed Will never wear, break or fail - Guaranteed Toughest finish - Guaranteed Safest way to lift - Guaranteed