Fabtech Radius Arm Kit

Fabtech Radius Arm Kits: Legendary Strength for Serious Trucks

When it comes to lifting heavy-duty trucks without sacrificing ride quality or geometry, few names carry as much weight as Fabtech. Their Radius Arm Kits represent one of the most thoroughly engineered suspension solutions available for solid-axle trucks — a product line shaped by decades of off-road racing experience and real-world heavy-duty use.

The Patented Tubular Radius Arm Advantage

Fabtech's Radius Arm Kits feature patented Radius Arms with a full tubular structure strengthened by dimple die side plates. The tubular structure design draws from Fabtech's extensive off-road racing history and results in a suspension system with superior strength that can handle rugged off-road terrain while still performing comfortably on everyday roads. The arms are also thoughtfully offset: they are offset for full turning radius with 12.50-wide tires on 5-inch back space wheels, so running oversized rubber doesn't mean sacrificing maneuverability.

Caster correction is built directly into the design. Fabtech Radius Arms have 1 degree of caster built in for the increased ride height, and adjustable alignment cams on the arms allow for an additional 1.5–2 degrees of caster adjustment. This means your steering feel and highway tracking stay dialed in — not an afterthought.

On select heavy-duty platforms, Fabtech takes durability even further. Each Radius Arm features Fabtech's proprietary 5 Ton Joint on the pivot side at the frame — joints that have been proven in rugged military use for over 10 years and are both quiet and strong.

Complete System Engineering — Not Just Lift Arms

A Fabtech Radius Arm Kit isn't just a pair of arms — it's a comprehensive suspension system. Fabtech's coil springs retain the factory load-carrying capacity while providing increased suspension travel, with the associated bracketry allowing for an additional inch of compression travel over stock without binding the suspension. Each coil is preset during the manufacturing process to ensure no ride height settling over time.

Supporting hardware is equally robust. Fabtech includes a heavy-duty 1/4-inch thick steel Track Bar mount that repositions the track bar and front axle under the vehicle to factory specifications, providing proper tracking of the front and rear axle for excellent highway manners. Brake lines are relocated down on the frame with extension brackets to eliminate the possibility of overstretching, keeping the factory brake system sealed for fast and trouble-free installation.

Shock Options to Match Your Driving Style

Fabtech Radius Arm Kits are offered with multiple shock absorber tiers to suit different budgets and performance needs. The Performance Shock package offers high velocity 9-stage valving for excellent dampening capabilities and a closed cell insert to reduce shock fade at high speeds. Step up to the Stealth monotube option and you get a 46mm diameter high-flow piston with vehicle-specific valving, plus Nitrocarburized piston rods that are superior to chromed rods in durability and corrosion resistance. For the most demanding off-road use, the Dirt Logic 2.25 shocks are a larger, more robust configuration pre-tuned for each Fabtech suspension, accounting for larger tires and providing the finest all-around damping.

Proven in Consumer, Commercial, and Military Applications

The design has been proven in over 10 years of service in consumer, commercial, and military applications, with high-quality components and properly designed suspension geometry setting these systems apart from all other Radius Arm suspensions. Every kit is also backed by Fabtech's impressive warranty: a free 5-year, 60,000-mile powertrain warranty.

Whether you're running a Ford Super Duty F-250, F-350, F-450, or F-550, or a Ram 2500, Fabtech's Radius Arm Kit lineup offers a purpose-built solution that elevates both capability and confidence — on the trail and on the commute.