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

Built for Ford F-250 Super Duty owners who want maximum ground clearance and tire capability without sacrificing ride quality, this 6-inch radius arm coilover conversion lift kit delivers a total suspension transformation. Run up to 37-inch tires while preserving factory-like suspension geometry through precision-fit radius arms and adjustable caster correction — so your truck rides smooth and handles predictably, even at full lift height.

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 — Complete component set engineered for third-generation Ford Super Duty diesel models.
• Block U-Bolt Kit (Overloads) — Fabricated steel blocks stronger and longer-lasting than cast alternatives, with anti-axle-wrap design to maintain stock ride quality.
• 6" Coilover Conversion Box — Top-mounted reservoir brackets and coil-over mounts fabricated from 1/4-inch steel to support the new shock setup.
• Radius Arm Upgrade Box (qty 2) — Heavy-duty radius arms equipped with durable rubber bushings for maximum vibration absorption; each arm weighs 27 lbs and bolts directly to factory mounts while maintaining factory suspension angles.
• Vertex 2.5" Adjustable Front Coilovers (Left & Right) — Monotube design with external reservoir, 8-stage adjustable damping, nitrogen-charged, and 56% greater fluid capacity than average reservoir shocks for optimal control.
• Vertex 2.5" Rear Coilovers (qty 2) — Matched rear shocks for balanced lift geometry and ride quality across the entire suspension.
• Adjustable Alignment Cam — Mounted at the axle to allow caster adjustment and preserve correct suspension geometry after install.

Important notes

• This kit is engineered for 2011–2014 Ford F-250 Super Duty 4WD diesel models only. It does not fit F-350 models, dually models, or gas engine variants.
• You must confirm whether your rear leaf springs are equipped with a factory overload spring — this affects installation and final geometry.
• Installation requires cutting and drilling; plan for 6–10 hours to complete the full conversion.
• Alignment is performed in-house as part of every lift install to ensure caster angles are corrected after the kit is bolted down.

Why customers pick this at Road Runner

• Rough Country's limited lifetime replacement warranty covers structural and workmanship defects — backed locally by our team.
• Radius arms are precision-fit to factory mounts, so bolt-on installation is cleaner and geometry stays true to Rough Country's design intent.
• Vertex 2.5-inch monotube coilovers with external reservoirs deliver 56% more damping fluid than standard shocks — you get adjustability and ride control that matches the lift height.
• Our technicians install these kits every week; we know the cutting and drilling points, torque specs, and brake-line routing that keeps your truck safe and aligned.

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