Rough Country's 6-inch Radius Arm Coilover Conversion Lift Kit transforms your 2017-2022 4WD F-250 or F-350 Super Duty Diesel into a capable, imposing truck without sacrificing the ride quality that makes these workhorses livable every day. The kit replaces the factory independent coil-and-shock setup with a full coilover conversion built around Rough Country's Vertex 2.5-inch piston, nitrogen-charged reservoir coilovers, clearing the way for tires up to 37 inches while keeping suspension geometry close to factory angles.
Upgraded radius arms preserve factory geometry. Each radius arm bolts directly into the factory mounts, maintaining a factory-like angle through the full range of suspension travel. At 27 pounds each, these arms are substantially heavier than stock and feature durable rubber bushings to absorb vibration before it reaches the cab. Keeping geometry correct is the single most important factor in preserving ride quality after a lift, and these arms address that directly.
Vertex coilovers deliver serious damping performance. The included 2.5-inch piston Vertex coilovers use a monotube design with an external reservoir for increased oil capacity and damping sensitivity. The external reservoir provides 56 percent greater fluid capacity than a standard reservoir shock, reducing fade during extended off-road use. Eight stages of adjustment let you tune compression and rebound to match your load and terrain. Top-mounted reservoir brackets and coilover mounts are fabricated from 1/4-inch steel for the rigidity this platform demands.
Fabricated rear lift blocks add durability to the package. The kit includes fabricated rear lift blocks that replace the factory lift block and outlast cast alternatives. Anti-axle-wrap geometry in the block design maintains stock ride quality while eliminating the axle wrap issues common to lift blocks under load. Multiple configuration options cover 3.5-inch and 4-inch axle fitments, factory overload spring applications, and a choice between V2 monotube or Vertex reservoir shocks, so the kit fits a wide range of Super Duty builds.
Product Benefits
- 6-Inch Lift: Adds significant ground clearance and accommodates tires up to 37 inches.
- Radius Arm Design: Bolts to factory mounts and keeps suspension geometry close to stock angles.
- Vertex 2.5in Coilovers: Nitrogen-charged monotube design with external reservoir and 8-stage adjustment.
- 56% Greater Fluid Capacity: Larger reservoir reduces damping fade under sustained off-road loads.
- 1/4-Inch Steel Mounts: Top-mounted reservoir brackets and coilover perches built for heavy-duty use.
- Fabricated Rear Blocks: Stronger than cast blocks with anti-axle-wrap geometry.
- Multiple Configuration Options: Choose axle size, overload spring fitment, and shock type to match your truck.
- Limited Lifetime Replacement Warranty: Covers manufacturer defects in structure and workmanship.
Note: Fits 2017-2022 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 the dial pin. Installation requires cutting and drilling; estimated installation time is 6-10 hours. New fabricated lift block replaces the factory-equipped lift block.
About Rough Country: Rough Country designs and manufactures lift kits, leveling kits, and off-road accessories for trucks and SUVs across a broad range of platforms. The brand focuses on delivering complete, vehicle-specific suspension solutions backed by fitment-engineered components and a limited lifetime replacement warranty.
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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 |
