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

Built for diesel F-250 Super Duty owners who demand factory ride quality with serious ground clearance, this 6-inch Radius Arm Coilover Conversion Lift preserves suspension geometry while letting you run 35–37" tires. Heavy-duty radius arms with rubber bushings absorb vibration, adjustable caster at the axle fine-tunes alignment angles, and Vertex 2.5-inch monotube coilovers deliver 56% greater fluid capacity than standard shocks for superior damping control.

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) — Main structural and fastener assembly.
• Block U-Bolt Kit — Rear block and fasteners; specially designed anti-axle wrap formula maintains stock ride quality.
• 6" Coilover Conversion Box — Top-mounted reservoir brackets and coil-over mounts fabricated from 1/4-inch steel for strength and durability.
• Radius Arm Upgrade Boxes (qty 2) — Heavy-duty radius arms equipped with durable rubber bushings; 27 lbs each, precision-fit to factory mounts and engineered to preserve suspension angles.
• Vertex 2.5 Adjustable Front Coilovers (LH/RH, 4.5–6 in) — Nitrogen-charged, 8-stage adjustable monotube shocks with external reservoir, 56% greater fluid capacity than average reservoir shocks, and integrated alignment cam for caster adjustment at the axle.
• Vertex 2.5 Rear Coilovers (qty 2, 6 in) — Monotube design with external reservoir for consistent damping.

Important notes

• Does not fit F-350 models, dually configurations, or gas-engine Super Duties. Diesel F-250 4WD only.
• Installation requires cutting and drilling; allow 6–10 hours for full completion.
• Adjustable caster cam at the axle permits post-install alignment fine-tuning to factory specifications.

Why customers pick this at Road Runner

• Geometry-correct design — radius arms maintain factory suspension angles, preserving ride quality after lift.
• Vertex 2.5-inch monotube coilovers with external reservoir — superior damping and 56% greater fluid capacity than standard shocks.
• Rough Country lifetime warranty backed locally — structural and workmanship coverage from an authorized dealer you can trust.
• Professional installation by technicians who specialize in these kits — alignment performed in-house as part of every lift install.
• 100% bolt-on with caster adjustment — precision radius arms fit factory mounts, adjustable cams allow dial-in at install.

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