Superlift Suspension Radius Arm

Superlift Suspension Radius Arms: Engineered for Clearance, Built to Last

When a suspension lift moves the axle relative to the frame, the factory radius arms struggle to keep up — they can bind, alter caster geometry, and limit tire clearance. That's precisely the problem Superlift Suspension has spent decades solving with its purpose-built radius arms, designed from the ground up to work in concert with lifted suspension systems rather than fight against them.

The Superunner Radius Arm Line

Superlift's flagship standalone radius arm offering is the Superunner series — long-travel, steel-construction arms finished in a durable black powdercoat for corrosion resistance and lasting good looks. These radius arms are engineered specifically for lifted 4WD Ford trucks, improving drivability once a lift kit raises the suspension beyond the factory geometry's comfort zone. Compatible with lift heights from 4 to 6 inches, with select configurations supporting up to 8 inches of lift, the Superunner arms are sold individually or as a pair and are proudly made in America.

Radius Arms in Complete Lift Systems

Beyond standalone arms, Superlift integrates high-clearance tubular radius arms into several of its most popular complete lift kit packages for Ford Super Duty and RAM Heavy Duty platforms. These kits are engineered using OEM CAD models and the latest 3D design software, ensuring the replacement arms bolt directly into factory mounts without requiring cutting, welding, or drilling on most applications.

The arms themselves feature a press-fit OEM Cleveite bushing to reduce noise, vibration, and harshness (NVH) — a refinement that keeps the lifted truck feeling composed on daily road driving, not just on the trail. A "True Flat" jack plate surface and alignment cam bolts are also incorporated, while the arms are offset to the inside to maximize turning radius and tire clearance. The result is a radius arm that corrects suspension geometry and retains OEM caster and camber alignment specifications rather than simply relocating the axle.

For enthusiasts who want the ultimate in on-road adjustability, Superlift also offers the King Edition Radius Arm Lift Kit — a complete front-and-rear system pairing high-clearance tubular radius arms with King Shocks coilovers featuring external reservoirs and easily adjustable damping.

Why Superlift for Radius Arms?

• OEM-data engineering: Geometry is calculated using original equipment CAD data for accurate fitment and proper alignment retention.
• High-clearance tubular construction: Massive tubular steel arms provide the ground clearance needed for larger tires without sacrificing structural strength.
• Cleveite OEM-style bushings: Press-fit bushings reduce NVH and deliver a smooth, controlled ride on and off the pavement.
• Made in the USA: Superlift manufactures its radius arm components domestically, assembled at its Louisiana facility.
• Limited lifetime warranty: All Superlift suspension components, including radius arms, are backed by a limited lifetime warranty against defects in materials or workmanship.
• Broad vehicle compatibility: Applications span Ford Bronco, F-250, F-350 Super Duty, and RAM 2500/3500 diesel platforms.

Whether you're replacing worn arms on an existing lift or upgrading as part of a complete suspension package, Superlift Suspension brings decades of hands-on engineering expertise to its radius arm lineup — delivering the geometry correction and durability that serious off-road builds demand.