Fits:
2017-2026 Ford Super Duty F-450 4wd Diesel
2017-2026 Ford Super Duty F-550 4wd Diesel
Important Fitment Details:
- You may need to perform the Ride Height Recalibration routine if your truck is equipped with headlamp leveling sensors.
- Does not fit on gasoline powered trucks.
Features:
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Complete Suspension System - Includes springs, shocks, radius arms, bump stop spacers, and hardware for a properly matched leveling package
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Dual-Rate 2.125" Lift Coil Springs – Specifically designed for Ford Power Stroke Super Duty trucks to improve ride quality while maintaining towing and hauling capability
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Heavy-Duty Radius Arms - Fully boxed design adds strength while correcting suspension geometry on lifted trucks
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FOX Performance Series 2.0 IFP Shocks – Race-proven monotube shocks featuring Internal Floating Piston (IFP) technology for improved damping consistency, ride control, and off-road performance
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Corrosion Resistant Shock Construction – Clear-anodized 6061-T6 aluminum shock bodies resist rust and improve heat dissipation compared to traditional steel-body shocks
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Adjustable Caster Correction - Selectable +2°, +4°, and +6° caster settings improve steering stability and return-to-center after lifting
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Improved Ride & Handling - Components are engineered to work together for better drivability, control, and comfort on-road and off-road
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6061 Billet Bump Stop Spacers - Maintains proper suspension engagement and travel on lifted applications
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Direct Bolt-On Installation – No cutting, welding, or fabrication required
Description:
The Kryptonite Stage 3 Leveling Kit with FOX Performance Series 2.0 IFP Shocks is a complete front suspension system engineered specifically for 2017-2026 Ford F-450 and F-550 Super Duty diesel trucks. Designed to improve ride quality, suspension geometry, steering stability, and overall durability, this package combines Kryptonite’s heavy-duty suspension components with FOX’s race-proven shock technology to create a suspension system built for demanding work trucks and recreational towing applications.
At the core of the system are Kryptonite’s dual-rate coil springs, engineered around the unique weight and suspension requirements of the F-450 and F-550 platform. Unlike generic leveling springs, these coils are designed to improve ride comfort and suspension compliance while still maintaining the load-carrying capability these trucks are known for. Whether towing heavy trailers, hauling equipment, or driving unloaded, the spring design helps provide a controlled and comfortable ride without compromising capability.
Handling suspension duties are FOX Performance Series 2.0 IFP shocks. Featuring a monotube design with an Internal Floating Piston, these shocks separate shock oil from the high-pressure nitrogen gas chamber to eliminate aeration and maintain consistent damping performance. FOX’s application-specific valving and race-developed high-flow piston design provide excellent control over rough pavement, expansion joints, washboard roads, and uneven terrain while delivering predictable handling both on and off-road. The precision-machined 6061-T6 aluminum shock body improves cooling efficiency and will never rust, making it ideal for trucks that see year-round use in harsh environments.
Kryptonite heavy-duty radius arms further improve suspension performance by correcting front suspension geometry while significantly increasing strength and rigidity over factory components. Their fully boxed construction, internal gusseting, and adjustable caster correction allow steering geometry to be properly dialed in after lifting, improving straight-line tracking, reducing wander, and enhancing return-to-center characteristics.
Combined with billet aluminum bump stop spacers and premium hardware throughout, this complete suspension system delivers improved ride quality, better steering control, enhanced durability, and the confidence expected from a Super Duty built to handle heavy workloads both on and off the pavement.
Includes:
- 2 x Fox 2.0 Performance Series Front shocks - KRS155
- 2 x Fox 2.0 Performance Series Rear shocks - KRS151
- 2 x 3" Leveling Coil Springs - KRFC25
- 2 x Radius Arms - KRFDRD1
- 1 x Adjustable Track Bar - KRFTB11-2
- 1 x Bump Stop Spacer Kit - KRFB25
- 1 x Brake Line Relocation Bracket - KRFB17
Warranty:
(Kryptonite No Fine Print Lifetime Warranty)
Kryptonite Steering & Suspension components are warrantied for life to their original purchaser. This warranty covers manufacturer defects, premature wear, or breakage. Race it, jump it, off‑road it, wreck it, lift it—we don’t care. If you can break it, we’ll replace it.
Your Kryptonite products must be purchased through an Authorized Dealer, and Warranty Registration completed within 90 days of purchase. Complete warranty details can be found [here].
