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

Built for diesel F-250/F-350 Super Duty owners who want 6 inches of ground clearance without sacrificing factory suspension geometry, this Rough Country radius arm lift kit combines aggressive stance with balanced on and off-road ride quality. The kit preserves factory angles through precision-fitted radius arms and an adjustable caster cam, so your truck handles like it was engineered this way — and you can fit 35–37 inch tires.

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 Boxes — Heavy-duty arms with durable rubber bushings for vibration absorption, engineered to maintain factory suspension angles while delivering 27 lbs of increased durability per side.
• N3 Shock Kit — Application-valved shocks tuned for balanced performance on road and off-road, ensuring smooth ride quality after the lift.
• 6-Inch D-Coil Springs — Fabricated coils stronger and longer-lasting than cast alternatives, lifting the front to level with the rear.
• Add-A-Leaf — Reinforces rear springs for payload capacity and durability under the new lift geometry.
• 3-Inch Fabricated Blocks & U-Bolt Kit — Rear lift blocks that work with the add-a-leaf to achieve 6-inch rear clearance.
• Adjustable Alignment Cam — Allows caster correction at the axle to fine-tune geometry after install.
• Track Bar Relocation Bracket & Drop Pitman Arm — Maintain proper steering geometry and suspension angles under the new lift height.
• Brake Line Relocation Brackets — Protect brake lines from damage and ensure clearance with new suspension travel.

Important notes

• Fits diesel F-250/F-350 Super Duty models only (2005–2007, 4WD). Does not fit dually models or gas-engine variants.
• Factory rear contact overload springs must be removed as part of installation.
• Recommended tire range: 35–37 inches. Larger tires may require trimming or additional modifications.

Why customers pick this at Road Runner

• 100% bolt-on design — no cutting, drilling, or fabrication required; installs faster than competing kits this size.
• Geometry-correct radius arms preserve factory suspension angles, so your truck drives smooth on daily roads and off-road terrain.
• Adjustable caster cam included — alignment performed in-house as part of every lift install, ensuring proper steering feel and tire wear.
• Rough Country lifetime warranty backed locally by Road Runner techs who service these kits every week.
• N3 shocks tuned for balanced ride — no harsh bouncing, no wallowing on load.

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