6-Inch Lift Kit with M1 Shocks for Ford Super Duty 4WD (2017–2022), Part 55840

6-Inch Lift Kit with M1 Shocks, fitment-checked

Rough Country 55840 is a 6-inch lift kit for 2017–2022 Ford F-250 and F-350 Super Duty 4WD diesel models. Two pairs of M1 monotube shocks, front coils, radius arm drop and upgrade boxes, a transfer case clocking kit, and 4.5-inch fabricated rear blocks with U-bolts make up the package. Gas engine, dually, manual shift transfer case, and Tremor trucks are excluded.

This 6-inch lift kit for the 2017–2022 Ford F-250/F-350 Super Duty 4WD raises the front to sit level with the rear and opens up clearance for larger tires. Radius arm drop brackets reset caster so steering feel stays close to factory, while the fabricated anti-axle-wrap rear blocks handle the back of the truck. Confirm your truck before ordering: the kit rules out gas engines, dually axles, manual shift transfer cases, 3.5-inch rear axle tubes, factory contact overload springs, and the Tremor package. A downloadable Rough Country installation guide is available.