6" 2023-2025 Ford F450/F550 4WD (w/Diesel Engine) Radius Arm Lift Kit by Fabtech

Fabtech’s K2429, a 6-inch Radius Arm Lift Kit, is engineered for Ford F-450 and F-550 Super Duty trucks, built to meet the demands of both rugged off-road terrain and smooth on-road driving. This high-performance system enhances vehicle strength and ride quality, offering superior ground clearance and tire clearance while maintaining OE comfort and load capability.

The system centers around Fabtech’s signature tubular Radius Arms, featuring a redesigned construction with modern side plate styling and laser-cut detailing. These arms provide unmatched strength and are offset for full steering articulation with 12.50” wide tires. Complementing the arms are Fabtech’s high-performance coil springs, performance shocks, and a complete set of heavy-duty brackets designed to correct geometry and enhance durability.

From drop pitman arms and sway bar brackets to track bar relocation and brake line support, every component has been precision-crafted for seamless integration. This comprehensive suspension system transforms the Super Duty into a bold, aggressive machine, whether on pavement or off the beaten path. Backed by a 5-year / 60,000-mile powertrain warranty for added peace of mind.

Top Features and Benefits

• 6″ lift kit designed for Ford F-450/F-550 Super Duty trucks
• Redesigned tubular radius arms with modern side plates and laser-cut logo
• Radius arms provide an additional 1.5° caster adjustment and full steering clearance for 12.50” wide tires
• Fabtech front coil springs deliver a compliant ride and resist sagging over time
• Track bar relocation bracket centers the axle under increased lift height
• Forged dropped pitman arm enhances steering geometry with lift
• Heavy-duty bump stop brackets prevent over-cycling during full suspension compression
• 1/4″ steel sway bar drop brackets maintain proper link angles at the new height
• Brake line relocation brackets preserve the factory fluid system without disconnecting lines
• Steering stabilizer bracket retains the OE stabilizer for improved control
• Rear lift blocks maintain ride quality and load capacity
• High-strength U-bolts securely fasten the rear differential
• Includes front and rear performance shocks for balanced damping
• All components are engineered for bolt-on installation with precise fitment
• Backed by Fabtech’s 5-year / 60,000-mile powertrain warranty

Performance Twin Tube Shock:

• Twin Tube Hydraulic Construction
• 9/16″ Hardened Chrome Piston Rod
• 1 3/8″ OD Piston
• Closed Cell Foam insert
• High Flow 9-Stage Valving

Stealth Monotube Shock:

• 50mm OD Seamless Steel Body
• 46mm High Flow Piston for the best ride
• Vehicle-specific valving designed for oversized tires
• A full-floating piston separates gas from oil for a consistent ride
• 14mm Nitrocarb piston rod resists rock chips and rusting
• All black finish with raised nameplate as a signature of quality

Dirt Logic 2.25 Shock:

Tire and Wheel Options:

• Tire Size – 38/12.50R17 Wheel Size – 17×9 w/ 4 3/4in BS w/minor trimming
• Tire Size – 38/12.50R18 Wheel Size – 18×9 w/ 4 3/4in BS w/minor trimming
• Tire Size – 38/12.50R20 Wheel Size – 20×9 w/ 5in BS w/minor trimming
• Tire Size – 40/12.50R17 Wheel Size – 17×9 w/ 4 3/4in BS w/cutting
• Tire Size – 40/12.50R18 Wheel Size – 18×9 w/ 4 3/4in BS w/cutting
• Tire Size – 40/12.50R20 Wheel Size – 20×9 w/ 5in BS w/cutting