Special Shipping Required. This item must be shipped via truck freight and requires delivery to a business address equipped with a dock or forklift.
Fabtech’s Radius Arm System for the Ford Super Duty is engineered to meet the demanding on-road and off-road requirements of truck enthusiasts. This complete suspension upgrade replaces key factory components to deliver increased strength, improved geometry, and long-term durability when running oversized tires.
At the core of this system are Fabtech’s heavy-duty tubular Radius Arms. Inspired by Fabtech’s race-proven suspension components, these arms feature a tubular structure reinforced with dimple-die side plates and heavy gusseting for rugged off-road use. This design offers a significant strength upgrade over factory stamped arms.
This system includes the massive Dirt Logic 4.0 Coilover Conversion, providing outstanding off-road damping capability while maintaining a smooth and controlled highway ride. The coilovers bolt directly into the factory coil spring location without requiring removal of the original coil 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 with oversized tires. As the largest and most robust coilover available for the Ford Super Duty platform, it is built to withstand the harshest driving conditions.
High-quality components combined with properly engineered suspension geometry set this Radius Arm system apart from other Radius Arm suspensions. The system includes a free 5-year, 60,000-mile powertrain warranty for added peace of mind.
Each Fabtech component has been designed with specific features and benefits that create this premium suspension system. Detailed component information is outlined below.








