6" 2023-2026 Ford F250 / F350 Super Duty 4WD Coilover Conversion Lift Kit (w/Radius Arms) by Rough Country

400458 and 400459 Rough Country 6-inch Coilover Conversion Lift Kits are designed for Ford F-250 and F-350 Super Duty trucks, delivering premium suspension performance, increased ground clearance, and aggressive styling while maintaining smooth ride quality and predictable on-road handling. Engineered for drivers who demand maximum control both on and off-road, these systems provide clearance for up to 37-inch tires and eliminate factory rake for a leveled, commanding stance.

At the center of these systems are fully adjustable Vertex coilovers with a 2.5-inch, nitrogen-charged monotube design and external reservoirs. The remote reservoirs significantly increase fluid capacity, improving heat dissipation and consistent damping performance during heavy towing, off-road use, and long-distance driving. A secondary V2 front monotube shock is included at each front corner, creating a dual-shock setup designed to improve suspension stability, steering response, and overall ride control across varying terrain.

Built for strength and durability, these coilover conversion systems feature heavy-duty, fabricated 1/4-inch coilover mounts and oversized tubular radius arms with a massive 2-inch outer diameter. The radius arms bolt directly into factory mounting locations while maintaining proper caster geometry and factory-like suspension angles. Durable rubber bushings help reduce vibration and road noise for improved ride comfort during daily driving and off-road use alike.

In the rear, heavy-duty fabricated lift blocks offer greater durability than traditional cast blocks, while an integrated anti-axle-wrap design helps maintain ride quality and minimize unwanted axle movement under load. Designed as a complete bolt-on suspension upgrade with no cutting or drilling required, these Rough Country 6-inch lift kits deliver increased off-road capability, improved suspension performance, and premium ride quality for Super Duty owners looking for a high-performance suspension system.

Features and Benefits:

• 400458 and 400459 Rough Country 6-inch coilover conversion lift kits for Ford F-250 and F-350 Super Duty
• Provides clearance for up to 37-inch tires
• Fully adjustable Vertex 2.5-inch remote reservoir coilovers
• Remote reservoirs improve cooling and damping consistency
• Secondary V2 front monotube shocks improve stability and steering response
• Heavy-duty fabricated 1/4-inch coilover mounts for increased durability
• Tubular radius arms correct caster geometry and maintain proper suspension angles
• Radius arms feature oversized 2-inch outer diameter construction
• Factory-mount compatible radius arms simplify installation
• Durable rubber bushings reduce vibration and road noise
• Heavy-duty fabricated rear lift blocks offer superior strength and durability
• Anti-axle wrap rear blocks improve ride quality and axle stability
• Front-to-rear leveling design eliminates factory rake
• Top-mounted reservoir brackets provide a clean and secure installation
• 100% bolt-on installation with no cutting or drilling required
• Choose V2 or Vertex rear shocks
• Improves off-road capability while maintaining predictable on-road handling
• Backed by Rough Country's limited lifetime replacement warranty