6 Inch Lift Kit | Gas | Radius Arm | C/O Vertex | Ford F-250/F-350 Super Duty (05-07)

6-Inch Radius Arm Coilover Conversion Suspension Lift for Ford F-250/F-350 Super Duty (05-07)

Elevate your first-generation Ford Super Duty with Rough Country’s 6-inch Radius Arm Coilover Conversion Suspension Lift. This all-inclusive kit is engineered to support up to 37-inch tires while preserving the smooth, factory-like ride you expect from a Rough Country upgrade.

Why this kit stands out

• Factory-leaning geometry keeps suspension angles close to stock, delivering confident handling and ride quality even with a significant lift.
• Ultra-durable Radius Arms—weighing 27 lbs each with rugged rubber bushings—to minimize vibration and maximize durability when hitting rough terrain.
• Coilover conversion replaces the factory independent coil/shock setup with a robust 2.5" piston, nitrogen-charged Vertex Coilover for consistent damping and performance.
• Monotube design with external reservoir increases oil capacity and damping sensitivity for a smoother ride and improved control on and off-road.
• Greater fluid capacity—the Vertex Coilovers offer 56% more fluid than the average reservoir shock, delivering steadier performance under load and during prolonged abuse.
• Top-mounted reservoir brackets and 1/4" steel coilover mounts provide durable, precise mounting and long-lasting performance.

Key components and tech

• Radius Arms: precision-fit to bolt into factory mounts for easier installation.
• Vertex Coilovers: 2.5" piston, nitrogen-charged, 8-stage adjustable, monotube with external reservoir.
• High-strength mounts: top-mounted reservoir brackets and 1/4" steel coilover mounts.
• Suspension geometry preserved to maintain a near-factory ride quality with a 6" lift.

Fitment and ride details

Designed for Ford F-250/F-350 Super Duty trucks from 2005 to 2007. Supports up to 37-inch tires, enabling a substantial stance without sacrificing control, stability, or comfort. The kit is engineered to work with a 6-inch lift height while maintaining predictable handling characteristics across a range of terrains.

Installation

Requires cutting and drilling to install. Estimated timeframe is 6–10 hours. While a challenging project, it can be completed at home with the right tools and careful workmanship, delivering a factory-like upgrade experience without a full professional install.

Warranty and peace of mind

Rough Country backs this 6-inch Radius Arm Coilover Conversion Suspension Lift Kit with a Limited Lifetime Replacement Warranty against manufacturer defects. This coverage provides protection for structural and workmanship issues from the date of purchase, helping you ride with confidence behind a high-quality upgrade.