Prothane Radius Arm Bushing

Prothane Radius Arm Bushings: Polyurethane Precision for Trucks That Work Hard

The radius arm bushing is one of the most mechanically critical points in a solid-axle front suspension. Radius arms tie the control arm to the chassis, limiting forward and rearward tire movement during acceleration and braking. When those bushings wear out — and stock rubber ones inevitably do — you'll notice it immediately in the form of vague steering, wandering under braking, and a front end that simply refuses to feel planted. That's where Prothane steps in.

Radius arm bushings from Prothane are manufactured from high-performance polyurethane, a fundamentally different material than the OE rubber they replace. Rubber is prone to cracking, rotting, and deteriorating under the stress of road contaminants, UV exposure, and repetitive compression cycles. Prothane's polyurethane formulation resists all of these failure modes, delivering a bushing that is more dimensionally stable and far longer-lasting than any factory rubber alternative.

Why Prothane Stands Apart in This Category

Founded in 1991, Prothane was built from the ground up by car racers and enthusiasts who understood that suspension compliance is the enemy of performance and handling consistency. Over more than 30 years, the brand has grown from fewer than 100 part numbers to an extensive catalog of over 10,000 — all manufactured in the USA with proprietary urethane formulations and precision engineering methods.

Their radius arm bushings reflect that same engineering philosophy. Available in both classic red and stealth black polyurethane, both colors share the same durometer rating and performance characteristics. The black variants incorporate a small amount of graphite into the compound, which can further reduce the potential for squeaking. Prothane also bundles its own proprietary Super Grease with bushings that require lubrication at installation — a thoughtful touch that ensures long-term, squeak-free performance right from the start.

One of Prothane's signature design approaches involves splined bore geometry in select bushing designs, which grease channels to prevent metal-on-poly contact and extend service life. Every radius arm bushing set is engineered to be a direct-fit replacement — no cutting, drilling, or modification required — making them accessible to experienced DIYers and professional shops alike.

Fitment Highlights

Prothane's radius arm bushing lineup is particularly well-suited to classic and modern Ford trucks and SUVs, including the iconic Ford F-100 and Ford Bronco. Fitment-specific kits are designed to drop in as complete sets, restoring — and improving upon — the handling dynamics your truck had when new. Whether you're building a trail-ready Bronco or returning a vintage F-100 to tight, responsive driving feel, Prothane offers an application-specific solution with no guesswork involved.

A Lifetime Warranty You Can Count On

Prothane backs every radius arm bushing with a lifetime warranty against defects in materials and workmanship for as long as the original purchaser owns the vehicle. That kind of confidence in a suspension component is rare — and it reflects decades of refinement in urethane chemistry and precision molding. Browse the full radius arm bushing selection or explore the complete Prothane catalog to find the right upgrade for your application.