6" 2023-2026 Ford F450/F550 4WD (w/diesel engine) 4-Link Lift Kit by Fabtech

Fabtech’s K2431 4-Link Lift Kit is the ultimate upgrade for Ford F450 and F550 Super Duty trucks, offering enhanced on-road performance and superior off-road capability. This high-end suspension system replaces the factory Radius Arm setup with a bolt-on 4-link design that delivers exceptional articulation, improved ride quality, and reliable durability. Designed for less caster change throughout the suspension’s travel range, this system provides a smoother, more stable highway ride. Off-road, the 4-link design offers greater articulation than a traditional Radius Arm suspension, ensuring improved handling and terrain traversal at any speed.

The kit includes everything needed for the front suspension conversion, including heavy-duty replacement coil springs, billet sway bar links, a track bar relocation bracket, a dropped pitman arm, and more. The rear suspension is upgraded with a block and u-bolt kit, maintaining factory ride quality and load-carrying capacity while achieving the desired lift. Proven in over a decade of military applications, Fabtech’s 4-Link Lift Kit is built with precision and quality. The 2-inch OD heavy-wall link arms feature 1/4-inch thick steel brackets on the axle side and adjustable alignment cams to dial in the caster for the new ride height. Fabtech’s legendary 5-Ton joints® on the frame pivot side provide unmatched strength, backed by a lifetime warranty. The 4-link arms attach to 1/4-inch thick steel frame brackets integrated with the factory Radius Arm mounts, creating a solid and secure foundation for the upgraded suspension.

The included coil springs are hot-wound and preset to maintain their height over time, providing a compliant ride both on and off-road with a 2-inch increase in wheel travel when paired with Fabtech shock absorbers. The track bar relocation bracket centers the axle under the vehicle, while the dropped pitman arm ensures proper steering alignment. Heavy-duty front bump stop brackets prevent suspension over-cycling, sway bar drop brackets reposition the sway bar for smooth operation, and brake line brackets extend the factory lines for the increased travel range without modifying the hydraulic system.

Rear lift blocks and high-strength u-bolts complete the rear suspension, ensuring a secure fit for the rear differential. Steering stabilizer brackets retain the factory heavy-duty stabilizer, reducing tire shimmy and maintaining control. Backed by Fabtech’s free 5-year/60,000-mile powertrain warranty, this 4-Link Lift Kit represents the pinnacle of Super Duty suspension systems, combining advanced engineering, military-grade durability, and expert craftsmanship for unmatched performance on and off the road.

Top Features and Benefits

• Provides a 4-link suspension upgrade for Ford F450/F550 Super Duty, replacing the factory Radius Arm setup for enhanced performance
• Delivers less caster change through the suspension’s travel range for a smoother and more stable highway ride
• Improves off-road articulation and terrain traversal at all speeds compared to Radius Arm suspensions
• Includes heavy-duty 2-inch OD link arms with 1/4-inch thick steel brackets and adjustable alignment cams for precise caster adjustments
• Features Fabtech's 5-Ton joints® on the frame pivot side for unmatched durability and backed by a lifetime warranty
• It comes with replacement coil springs that are hot-wound and preset for a compliant ride with no height settling over time, providing 2 inches of increased wheel travel.
• Heavy-duty track bar relocation bracket centers the axle under the vehicle and eliminates deflection during movement.
• When paired with the track bar bracket, a dropped pitman arm ensures proper steering alignment.
• Front bump stop brackets prevent suspension over-cycling and withstand full compression impacts.
• Sway bar drop brackets reposition the sway bar to operate smoothly at the increased ride height.
• Brake line brackets extend factory lines for the increased travel range without modifying the hydraulic system.
• Rear lift blocks maintain factory ride quality and load-carrying capacity while achieving additional lift.
• High-strength U-bolts securely attach the rear differential for reliable performance.
• Steering stabilizer brackets retain the factory stabilizer to reduce tire shimmy and enhance control.
• Proven durability with over 10 years of military application experience
• Backed by a 5-year/60,000-mile powertrain warranty for peace of mind and long-term reliability

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: