Carli Suspension Radius Arm

Why Carli Suspension Radius Arms Stand Apart

When it comes to heavy-duty truck suspension, few upgrades deliver as noticeable an improvement as replacing the factory radius arms — and no one does it better than Carli Suspension. Founded in 2003 by Sage Carli, the California-based brand was built around a single premise: that OEM suspension is engineered to minimize cost, not maximize performance. Carli's fabricated radius arms are a direct answer to that compromise, and they represent one of the most impactful single-component upgrades available for lifted full-size trucks.

The Problem with Factory Radius Arms

Stock radius arms on Ford Super Duty and Ram 2500/3500 trucks are stamped steel components with vulcanized rubber joints — a design that prioritizes ease of manufacturing over longevity and feel. Under lifted conditions, these factory arms introduce bind, wandering steering, and degraded caster geometry. Aftermarket radius arms exist specifically to solve these issues, and Carli's approach goes far beyond simply replacing one steel arm with another.

Carli's Fabricated Radius Arm Engineering

Carli Suspension's fabricated radius arms are conceived through CAD-assisted engineering, and their construction reflects that precision. At the core of every arm is an internal network of X-braces and gussets that lock all structural facets into one cohesive, bulletproof unit — a fully boxed design with full-length internal gusseting that gives these arms exceptional rigidity under load.

• 17-4 Stainless Spherical Joints: Each arm features a rebuildable 17-4 stainless steel spherical joint, eliminating the kinetic bind associated with factory rubber bushings and allowing the suspension to cycle freely with no resistance.
• High-Clearance Formed Channel: A purpose-built formed channel is incorporated into the arm design to relieve tire rub, making room for aggressive off-road tires and deep-offset aftermarket wheels — including up to 37-inch tire fitment near stock backspacing.
• Quad-Wrap Limit Straps: Included limit straps protect shocks from top-out damage during full articulation, a detail that reflects Carli's system-level thinking.
• ABS Harness Clamp: A dedicated clamp keeps the factory ABS harness secured and protected, preserving OEM safety systems without modification.
• Bolt-On Installation: Despite their upgraded construction, Carli's fabricated radius arms replace the factory arm using factory mounts and brackets — no cutting or welding required.

Coverage: Ford Super Duty & Ram 2500/3500

Carli offers fabricated radius arms for both major platforms that use this suspension design. Ford F-250 and F-350 Super Duty trucks from 2005 through current generation are supported, with specific fitment options for the 2023+ Super Duty platform. Ram 2500 and 3500 4x4 trucks are also covered, with arms hand-welded at Carli's California facility that directly replace the weak factory Ram arms and their subpar rubber joints. These arms improve steering feel, front-end articulation, and overall ride quality — gains that Ram owners consistently describe as transformative compared to springs and shocks alone.

Whether you're building out a Carli Commuter-level leveling system or working toward a full Dominator long-travel setup, the fabricated radius arms serve as a foundational component of any serious Carli build. Explore the full range of Carli Suspension products or browse all Radius Arms to find the right fit for your truck.