Fabtech’s 4 Link Conversion System for the Ford Super Duty is engineered to deliver improved on-road performance while providing the strength and articulation required to conquer the most demanding off-road terrain. This premium system is a complete bolt-on replacement for the factory Radius Arm suspension and includes all necessary components to convert the front suspension to a true 4 Link design.
The 4 Link geometry significantly reduces caster change throughout the suspension travel, resulting in improved highway stability and predictable handling. Off-road, the system delivers increased articulation compared to a traditional Radius Arm suspension, allowing the vehicle to maintain traction and control across rugged terrain at all speeds.
This system includes the massive Dirt Logic 4.0 Coilover Conversion, offering exceptional damping performance for aggressive off-road use while maintaining a smooth and controlled ride on pavement. The coilovers bolt directly into the factory coil spring location without requiring removal of the coil spring bucket, ensuring a clean and efficient installation.
The Dirt Logic 4.0 Coilovers feature a giant 4-inch diameter aluminum remote reservoir mounted horizontally above the coilover, allowing full compression travel when running oversized tires. As the largest and most robust coilover available for the Ford Super Duty platform, this setup is built to withstand extreme driving conditions.
Fabtech’s 4 Link System has been proven through more than a decade of use in military applications, validating its strength, reliability, and performance. Precision-engineered suspension geometry combined with premium materials makes this system the pinnacle of Super Duty suspension upgrades. A free 5-year, 60,000-mile powertrain warranty is included.
Each Fabtech component is manufactured in-house and designed with specific features and benefits that are detailed below.








