Six inches of lift, radius arm geometry correction, and your choice of shock technology combine in one bolt-on kit for the 2017-2022 4WD F-250 and F-350 Super Duty diesel. Rough Country engineered this kit around a set of fabricated radius arms that bolt directly to the factory mounts, keeping suspension angles close to stock so the truck drives the way it should even with substantial lift. The result is a Super Duty that clears tires up to 37 inches without the harsh ride or wandering steering that poorly designed lift kits introduce.
Radius arm geometry at the core. The fabricated radius arms weigh 27 pounds each and replace the factory units with drop brackets that restore proper caster angle. Caster is the single biggest factor in straight-line stability and return-to-center steering feel after a lift, and getting it right is what separates a radius arm kit from a simple spacer lift. Durable rubber bushings absorb vibration and keep NVH levels manageable for a truck used daily.
Anti-wrap rear blocks that actually work. The fabricated rear lift blocks use an anti-axle-wrap design that prevents the binding and pinion angle problems common to standard blocks under acceleration. Fabricated construction outperforms cast blocks in both strength and service life, and the geometry prevents the axle rotation that causes driveline vibration at lift heights this significant.
Your choice of shock absorber. The kit ships with your selection of Rough Country shock technology: the application-valved N3 series for balanced street and trail performance, the M1 or V2 monotube for improved heat dissipation and fade resistance, or the Vertex adjustable reservoir for tunable compression and rebound. Lifted coil springs are included and matched to the shock choice for consistent, predictable ride quality.
Product Benefits
- Six Inches of Lift: Fits tires up to 37 inches on 2017-2022 F-250 and F-350 Super Duty 4WD diesel models.
- Factory-Mount Radius Arms: Bolt directly to OEM locations for easier installation and corrected caster angle.
- Caster Correction: Radius arm drop brackets restore factory handling geometry after the lift.
- Anti-Axle-Wrap Rear Blocks: Fabricated design prevents axle wrap and driveline vibration under acceleration.
- Multiple Shock Options: Choose N3, M1 monotube, V2 monotube, or Vertex adjustable reservoir to match your driving style.
- Rubber Bushed Radius Arms: Absorb road vibration for a controlled, comfortable ride.
- All-Inclusive Kit: Includes radius arms, coil springs, rear blocks, shocks, and all necessary hardware.
- Lifetime Replacement Warranty: Covered by Rough Country's lifetime replacement warranty.
Note: Fits diesel models only. Does not fit gas engine models. Does not fit dually models. Does not fit models with manual shift transfer cases. Does not fit models equipped with the Tremor Factory Trim Package. Models equipped with a 10-speed transmission must remove dial pin. Kit offers options for 3.5-inch or 4-inch axle fitment, with or without factory overload spring fitment, and choice of N3, M1 monotube, V2 monotube, or Vertex reservoir shocks.
About Rough Country: Rough Country designs and manufactures lift kits, leveling kits, and off-road accessories for a wide range of trucks and SUVs. The brand focuses on delivering accessible, bolt-on suspension solutions that balance off-road capability with everyday drivability, backed by a lifetime replacement warranty on their suspension components.
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Product Specifications & Vehicle Fitment
Review the product details and confirm compatibility with your vehicle before ordering.
| Specification | Details |
|---|---|
| Vehicle Fitment | 2017, 2018, 2019, 2020, 2021, 2022 |
