6 Inch Lift Kit | Diesel | Radius Arm | C/o Vertex | Ford F-250 Super Duty (15-16)

Built for Ford Super Duty diesel owners who want serious ground clearance without sacrificing ride quality, this 6-inch radius arm coilover conversion lift kit transforms your third-generation truck while preserving factory suspension geometry. Run up to 37-inch tires and maintain that smooth, factory feel with Rough Country's precision-engineered setup.

Installed and serviced at Road Runner Wheels & Tires. Most lift kits go in the same day. Call (678) 400-6467 to schedule.

What's included

• Kit Box for Ford Super Duty (15-16) — structural backbone of the lift system.
• Block U-Bolt Kit (no overloads) — reinforced rear blocks engineered to eliminate common lift block issues and maintain stock ride quality.
• 6-inch Coilover Conversion Box — everything needed to swap your factory independent coil shocks for the upgraded system.
• Heavy-duty Radius Arms (pair) — precision-fit to factory mounts at 27 lbs each, featuring durable rubber bushings for maximum vibration absorption and caster correction.
• Vertex 2.5-inch Adjustable Front Coilovers (pair) — nitrogen-charged monotube design with external reservoir, 8-stage adjustability, and 56% greater fluid capacity than average reservoir shocks for optimal damping control.
• Vertex 2.5-inch Rear Coilovers (pair) — matching rear suspension with the same monotube, high-capacity design.

Important notes

• Diesel engine models only — does not fit gas-powered F-250 or F-350.
• Does not fit F-350 or dually models.
• Requires cutting and drilling for installation.
• Recommended tire size range: 35–37 inches.

Why customers pick this at Road Runner

• Radius arms maintain factory suspension angles — the secret to preserving ride quality after a 6-inch lift.
• Adjustable caster cam at the axle lets your tech fine-tune alignment geometry on the lift.
• Vertex coilovers feature 1/4-inch steel construction with top-mounted reservoir brackets — built to last.
• Rough Country's limited lifetime replacement warranty covers structural and workmanship defects — backed locally by Road Runner.
• Professional alignment performed in-house as part of every lift install — no extra trip needed.
• Our techs install these kits every week — fast, correct, and done right the first time.

Ready to build it? Call (678) 400-6467. Hablamos Español.