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 commanding stance with preserved factory geometry — this 6-inch radius arm lift kit levels your truck front-to-rear while maintaining suspension angles that keep ride quality balanced on and off the road. Sized for 35–37" tires, it's the upgrade that transforms your F-250 without sacrificing drivability.

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

• Radius Arm Upgrade Box (qty 2) — precision-fit radius arms engineered to preserve factory suspension angles, each weighing 27 lbs with durable rubber bushings that absorb vibration and maintain geometry during articulation.
• Vertex 2.5 FR Shocks (qty 2) — N2.0 series front shocks tuned for balanced on and off-road performance, damped to complement the lift while keeping daily-drive comfort intact.
• Vertex 2.5 RR Shocks (qty 2) — N2.0 series rear shocks matched to the front for consistent ride quality across all terrain.
• 6-inch D-Coil Spring — fabricated lift coil spring engineered to work with the radius arm geometry for proper load distribution and durability.
• Block U-Bolt Kit with Overloads — specially designed anti-axle-wrap rear blocks that maintain stock ride quality while eliminating common lift block issues; fabricated construction offers longer lifespan than cast alternatives.
• Adjustable Alignment Cam — allows caster correction at the axle after install to dial in geometry precisely.
• Track Bar Relocation Bracket & Drop Pitman Arm — ensure correct suspension geometry and steering angles post-lift.
• Brake Line Relocation Brackets — protect brake lines during articulation and prevent kinking.

Important notes

• Fits 2015–2016 F-250 Super Duty diesel 4WD models only. Does NOT fit F-350, dually models, or gas engine F-250s.
• ONLY compatible with vehicles equipped with rear factory contact overload springs.
• Recommended tire size range is 35–37 inches; staying within this window preserves the geometry correction this kit provides.
• 100% bolt-on installation — no cutting, drilling, or frame modification required.

Why customers pick this at Road Runner

• Rough Country lifetime replacement warranty backed by local service and parts availability.
• Geometry engineered to preserve factory suspension angles — caster adjustment cam lets our technicians dial in the perfect stance post-install.
• Professional alignment performed in-house as part of every lift install, ensuring straight tracking and tire wear from day one.
• Technicians install these radius arm kits multiple times each week — fast, correct, and done right the first time.
• 100% bolt-on design means faster install time and lower labor cost than frame-mount or welded alternatives.

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