ReadyLift 43-23450 4" Coil Spring Suspension System with Falcon MAX 3.3 Shocks and Radius Arms for 2023-2025 Ford Super Duty F250/F350 4WD

The ReadyLift 43-23450 is a complete 4-inch coil spring suspension system engineered specifically for 2023–2025 Ford Super Duty F250 and F350 4WD diesel trucks. This kit pairs newly engineered coil springs with four Falcon MAX 3.3 monotube piggyback shocks and heavy-duty tubular radius arms for a complete front and rear suspension upgrade that improves both on-road comfort and off-road capability.

At the heart of this system are the Falcon 3.3 Fast Adjust dampers, which feature dual-knob tunability so you can dial in the exact ride character you want. A 3-position fast adjust knob lets you switch between Soft, Custom, and Firm compression settings, while an 8-position micro-adjust dial provides fine-grained damping control for specific terrain conditions. The reservoir design increases the nitrogen-to-oil ratio for consistent damping performance across a wide temperature range, and the hard anodized large-bore 6061-T6 aluminum shock body resists impact and corrosion while maintaining increased oil volume for reliable, repeatable performance.

The included tubular radius arms correct the caster angle that changes when a truck is lifted, restoring proper suspension geometry. These heavy-duty arms are formed inward to provide additional tire clearance and are built to exceed the strength and durability of the factory radius arms. A Falcon dual steering stabilizer is also included to reduce bump steer and improve steering feedback, which is especially important on solid front axle trucks running oversized tires.

Key Features:

• 4-inch coil spring lift for 2023–2025 Ford Super Duty F250/F350 4WD (diesel, single rear wheel only)
• Four Falcon MAX 3.3 monotube piggyback shocks included — front and rear
• 3-position Fast Adjust compression knob (Soft, Custom, Firm)
• 8-position micro-adjust dial for terrain-specific fine tuning
• Soft mode bypasses main piston partially for a plush ride setting
• VOD (Volume Optimized Damping) digressive linear piston for reduced body roll
• Hard anodized 6061-T6 aluminum shock body for corrosion resistance
• Red Line high-VI shock oil rated from -50°F to 450°F
• Heavy-duty tubular radius arms for corrected caster angle and added tire clearance
• Falcon dual steering stabilizer to reduce bump steer
• Bolt-on installation — no cutting or drilling required
• Supports up to 37-inch tall tires on 9-inch wide wheels with +18 offset

Important Notes: This kit is designed for diesel-powered, single rear wheel (SRW) trucks only. Not recommended for 2WD or gas engine trucks. Tremor versions will not achieve the full 4 inches of lift over stock ride height. Trucks equipped with the factory Onboard Scale option will require the separate Auto-Leveling Headlight Bypass Bracket (PN: 67-23610). Single Cab configuration fitment and drivability has not been validated by ReadyLIFT.