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

Built for F-250 Super Duty diesel owners who want a 6-inch lift with factory-correct suspension geometry, this Rough Country Radius Arm Lift Kit delivers aggressive ground clearance while preserving the driveline angles that keep your truck riding smooth on and off the pavement. The kit clears 35"–37" tires and uses new radius arms, adjustable caster correction, and valved N2.0 shocks to maintain the balance between lifted stance and daily-driver comfort.

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

• Vertex 2.5 front shocks (qty 2) — Valved N2.0 series absorbers engineered for balanced on and off-road performance.
• Vertex 2.5 rear shocks (qty 2) — Matched rear units for consistent ride quality across all terrain.
• Radius arm upgrade boxes (qty 2) — Heavy-duty arms with durable rubber bushings for maximum vibration absorption, precision-fit to factory mounts and engineered to maintain stock suspension angles.
• Block U-bolt kit — Fabricated rear blocks that are stronger and longer-lasting than cast alternatives, specially designed to prevent axle wrap while preserving stock ride quality.
• Lifted coil springs — Factory-coordinated spring rate for proper load support.
• Adjustable caster alignment cam — Allows fine-tuning of front axle caster at installation to correct geometry.
• Track bar relocation bracket and drop pitman arm — Maintains steering geometry and clearance under full articulation.
• Brake line relocation brackets — Routes lines safely away from suspension travel.

Important notes

• This kit is engineered for 2015–2016 F-250 models equipped without rear factory contact overload springs. Does not fit F-350, dually, or gas-engine variants.
• Maximum tire clearance is 35"–37". Tire sizing outside this range may contact suspension components or fenders under load or articulation.
• The adjustable caster alignment cam must be dialed in during installation to restore proper front-end geometry; professional alignment performed in-house as part of your lift install.

Why customers pick this at Road Runner

• Rough Country lifetime warranty backed locally — if anything wears out, we stand behind it.
• Installed by technicians who perform radius arm lifts every week — no learning curve, consistent quality every time.
• Alignment performed in-house as part of every lift install — your caster is dialed before you drive away.
• 100% bolt-on design means faster install, lower shop time, and no cutting or drilling required.
• Factory-correct suspension angles preserve ride quality and driveline longevity — you get the lift without the harshness.

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