4.5" 2023-2026 Ford F250 / F350 Super Duty 4WD Coilover Conversion Lift Kit (w/Radius Arms) by Rough Country

400358 and 400359 Rough Country 4.5-inch Coilover Conversion Lift Kits are designed for Ford F-250 and F-350 Super Duty trucks, delivering premium suspension performance, aggressive ride height, and improved off-road capability while maintaining smooth on-road comfort. Engineered for drivers who demand more control and durability, these systems provide clearance for up to 35-inch tires and eliminate factory rake for a balanced, commanding stance.

At the core of these systems are fully adjustable Vertex coilovers featuring a 2.5-inch nitrogen-charged monotube design with external reservoirs. The remote reservoirs provide significantly increased fluid capacity for improved cooling and more consistent damping performance during heavy use, towing, or off-road driving. A secondary V2 front monotube shock is included at each front corner, creating a dual-shock setup that enhances ride stability, steering response, and suspension control across varying terrain.

Built for strength and long-term durability, these lift kits feature heavy-duty fabricated 1/4-inch coilover mounts and oversized tubular radius arms with a massive 2-inch outer diameter design. The radius arms bolt directly into the factory mounting locations while correcting caster geometry to maintain factory-like steering feel and suspension angles. Durable rubber bushings help reduce vibration and road noise for a smoother, quieter ride both on- and off-road.

In the rear, heavy-duty fabricated lift blocks provide superior strength over cast alternatives, while an integrated anti-axle-wrap design helps maintain ride quality and reduce unwanted axle movement during acceleration or towing loads. Designed as a complete bolt-on suspension system with no cutting or drilling required, these Rough Country coilover conversion kits deliver increased ground clearance, improved suspension performance, and premium ride quality for Super Duty owners looking to build a capable and reliable truck.

Features and Benefits:

• 400358 and 400359 Rough Country 4.5-inch coilover conversion lift kits for Ford F-250 and F-350 Super Duty
• Provides clearance for up to 35-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 suspension control
• Heavy-duty fabricated 1/4-inch coilover mounts for increased strength
• Tubular radius arms correct caster geometry and maintain factory-like 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 increased 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