Rear shocks configured with FOX 2.5 Performance Elite shocks featuring a Dual Speed Compression (DSC) adjuster with 10 low-speed and 12 high-speed compression levels, a 2.5-inch impact extruded aluminum body, a massive 7/8-inch hard chrome plated heat-treated alloy steel shaft, an external reservoir to separate shock oil from high-pressure nitrogen, and a black anodized aluminum reservoir for increased cooling efficiency. Fully serviceable and backed by a 1-year manufacturer's warranty.
Overview
The BDS 4-Inch Radius Arm Lift Kit is designed for the 2020–2022 Ford F-450 Super Duty 4WD. Built around a radius-arm setup, this kit prioritizes durability, straightforward design, and long-term reliability — qualities well-suited to the demands of a heavy-duty truck like the F-450. The heavy-duty radius arms are engineered to handle serious workload demands while maintaining predictable road manners, confident steering feel, and stability under towing and hauling. The front end is upgraded with FOX 2.5 Performance Elite coilovers, and steering geometry is corrected through a forged drop pitman arm and a heavy-duty track bar drop bracket.
Features
- Heavy-duty DOM steel radius arms replace factory stamped steel arms and restore proper caster angle, axle alignment, and suspension geometry to maintain predictable steering, stable handling, and prevent wander or tire wear
- Radius arms mount into the factory location with caster adjustment for a wide range of lift heights
- OE-style rubber bushings at the frame mounts isolate noise and vibration for a smoother, quieter ride with no ongoing greasing or maintenance required
- Front FOX 2.5 Performance Elite coilover conversion with remote reservoir for additional fluid capacity and DSC adjuster for precise tuning
- BDS forged drop pitman arm maximizes steering radius at 4 inches of lift
- Heavy-duty track bar drop bracket keeps steering geometry in phase through suspension travel and recenters the front axle
- Choice of FOX 2.5 Performance Series HTO or FOX 2.5 Performance Elite shocks for the rear
Specifications
- Lift Height: 4 inches
- Radius Arm Material: Heavy-duty DOM steel
- Front Shocks: FOX 2.5 Performance Elite coilovers with 2.5-inch impact extruded aluminum body, remote reservoir, and DSC adjuster (10 low-speed / 12 high-speed compression levels)
- Pitman Arm: BDS forged drop pitman arm
- Bushing Type: OE-style rubber bushings at frame mounts
- Vehicle Fitment: 2020–2022 Ford F-450 Super Duty 4WD
Installation
- Estimated Time: 8–10 hours
- Difficulty: Difficult
- Tools Required: Cut Off Wheel or equivalent, Reciprocating Saw, Welding Equipment
Important Notes
These kits are designed for the F-450 style front end. They do not work with the standard Ford Super Duty F-250/350 axle width.
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