6 Inch Lift Kit | Diesel | Radius Arm | M1 | Ford F-250/f-350 Super Duty (05-07)

Built for diesel F-250 and F-350 Super Duty owners who want 6 inches of ground clearance without sacrificing ride quality, this Rough Country radius arm lift kit preserves factory suspension geometry while accommodating 35"–37" tires. The bolt-on design keeps your truck's impressive factory angles intact — critical for maintaining driveline balance and handling on and off-road.

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) — Heavy-duty radius arms equipped with durable rubber bushings for maximum vibration absorption, precision-fit to factory mounts for easier installation and factory-like suspension angles.
• 6-Inch D-Coil Springs — Fabricated coils that are stronger and offer longer lifespan than cast alternatives, delivering the full 6 inches of lift.
• M1 Monotube Shock Pair (qty. 2) — Valved N3 series shocks engineered for balanced on and off-road performance, ideal for daily drivers.
• Add-A-Leaf — Reinforces rear leaf springs to support the new suspension geometry.
• 3-Inch Block and U-Bolt Kit — Rear axle blocks that work with the add-a-leaf to level the front with the rear of the vehicle.
• Adjustable Alignment Cam at the Axle — Allows caster adjustment to fine-tune geometry after installation.
• Track Bar Relocation Bracket and Drop Pitman Arm — Repositions steering and suspension links to maintain factory-correct angles throughout the lift.
• Brake Line Relocation Brackets — Ensures brake lines clear the new suspension travel safely.

Important notes

• Does not fit dually models or gas engine models — diesel Super Duty only.
• Factory rear contact overload springs must be removed as part of installation.
• Adjustable caster cam at the axle allows fine-tuning of suspension geometry; alignment performed in-house after install to ensure correct angles and tire wear.

Why customers pick this at Road Runner

• Rough Country lifetime warranty backed locally — if any component fails, we stand behind it.
• 100% bolt-on design — no cutting, drilling, or fabrication required; most trucks finish the same day.
• Geometry-correct radius arms preserve factory suspension angles, keeping ride quality balanced for both daily driving and off-road use.
• Professional alignment performed in-house as part of every lift install — caster cam adjustments dialed in by techs who do these every week.
• Valved N3 shocks tuned specifically for diesel Super Duty trucks — you get the shock package engineered for your truck, not a generic option.

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