6 Inch Lift Kit | Diesel | Radius Arm | C/o Vertex | Ford F-250 Super Duty (11-14)

Built for diesel F-250 Super Duty owners who want maximum clearance for 37-inch tires without sacrificing ride quality, this 6-inch Radius Arm Coilover Conversion Lift Kit transforms your truck's suspension geometry while preserving factory angles. You get adjustable Vertex 2.5-inch nitrogen-charged coilovers with monotube design and external reservoirs, paired with heavy-duty radius arms engineered to bolt into factory mounts — all the geometry correction you need in one complete package.

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

• Diesel Kit Box — Ford Super Duty application-specific components for your diesel model.
• Block U-Bolt Kit (No Overloads) — Fabricated blocks stronger and longer-lasting than cast alternatives, engineered with anti-axle wrap design to maintain stock ride quality.
• 6-Inch Coilover Conversion Kit Box — Top-mounted reservoir brackets and coil-over mounts constructed from 1/4-inch steel to support the new suspension geometry.
• Radius Arm Upgrade Boxes (qty 2) — Ultra-durable radius arms at 27 lbs each, precision-fit to factory mounts with rubber bushings for maximum vibration absorption and factory-like suspension angles.
• Vertex 2.5-Inch Adjustable Front Coilovers (Left and Right) — Nitrogen-charged, 8-stage adjustable monotube shocks with external reservoirs featuring 56% greater fluid capacity than standard reservoir shocks for superior damping control.
• Vertex 2.5-Inch Fixed Rear Coilovers (qty 2) — Matched pair for the rear, completing the coilover conversion and maintaining balanced suspension performance.

Important notes

• This kit is for diesel F-250 Super Duty models only — does not fit F-350 models, dually configurations, or gas-engine trucks.
• You must confirm whether your rear leaf springs are equipped with a factory overload spring before ordering, as this affects block selection.
• Installation requires cutting and drilling; allow 6–10 hours for completion. Professional installation at Road Runner eliminates guesswork and ensures proper geometry correction and alignment in-house as part of the lift install.
• Adjustable alignment cams at the axle allow caster correction after install, preserving factory suspension angles and ride quality.

Why customers pick this at Road Runner

• Geometry-corrected installation — Our technicians dial in caster and suspension angles after every lift, so your truck handles like factory, not chopped.
• Rough Country lifetime warranty backed locally — Coverage against structural and workmanship defects, honored on-site by the team that installed your kit.
• Expert diesel Super Duty technicians — We install these Vertex kits every week; no learning curve, no shortcuts.
• In-house alignment after every lift — Corrected geometry and tire wear prevention are included, not add-ons.

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