BDS Radius Arms

When upgrading your lifted Ford Super Duty or Ram HD, BDS Radius Arm Kits are the gold standard in strength, performance, and precision alignment. Designed to handle the increased stress of larger tires and off-road use, these heavy-duty radius arms maintain proper suspension geometry and deliver improved ride quality on and off the pavement.

Proudly Made in the USA, BDS Radius Arms are built from high-strength steel, precision-welded, and powder-coated for unmatched durability. Whether you’re daily driving, towing, or tackling rugged trails, they provide the perfect balance of control and confidence for lifted trucks.

In a lifted suspension system, the radius arm controls the fore/aft positioning of the front axle while maintaining caster and pinion angles. Factory arms are not designed for the increased geometry angles created by a lift. BDS Radius Arms solve this issue with longer, stronger construction and proper correction for suspension lift heights.

By optimizing front axle position and suspension travel, these arms help maintain:

• Proper caster angle for predictable steering

• Correct axle alignment to prevent drift and vibration

• Smooth ride quality and suspension articulation

In short, BDS Radius Arms restore the handling characteristics that are often lost after a lift kit installation.

BDS Radius Arms are built from massive 1/4-inch-thick steel plate, fully boxed and robotically welded for maximum rigidity. This design eliminates flex under load and provides the strength needed for off-road abuse or heavy towing.

Built-in caster correction adjusts for lift height, ensuring the front axle maintains proper alignment with the steering and drivetrain. This results in better straight-line stability, reduced tire wear, and improved road manners.

Unlike stock arms that hang low and snag obstacles, BDS arms feature a high-clearance bent-arm design that maximizes off-road capability without compromising strength.

When paired with a BDS suspension lift kit, these radius arms deliver smoother suspension movement and improved control, whether you’re hauling heavy loads or exploring backcountry roads.

Equipped with large, OE-style rubber bushings, BDS Radius Arms allow natural movement and articulation while eliminating metal-on-metal noise and the harshness of solid joints.

Each BDS Radius Arm is proudly engineered, manufactured, and tested in the USA, backed by the industry-leading No Fine Print Warranty — a true lifetime guarantee against bending, breaking, or cracking.

BDS Radius Arm Kits are precision-engineered for popular 3/4-ton and 1-ton trucks equipped with BDS lift kits or compatible aftermarket suspensions.

Supported Models Include:

• Ford Super Duty: F-250 / F-350 (2011–up) 4WD

• Ram Heavy Duty: 2500 / 3500 (2014–up) 4WD

These arms are designed to integrate seamlessly with BDS 2"–8" suspension lift systems and are compatible with most aftermarket coil spring and shock combinations.

Do BDS radius arms improve ride quality?
Yes. They maintain proper caster and axle position, which reduces bump steer and wandering, resulting in a smoother, more controlled ride.

Are BDS radius arms compatible with other lift brands?
In most cases, yes — as long as the lift height matches the correction range built into the arm. BDS designs these for OEM or BDS lift geometry.

Will I need an alignment after installation?
Yes. Any suspension or steering modification should be followed by a professional alignment to ensure proper caster and camber angles.

Are they stronger than stock radius arms?
Absolutely. BDS arms are constructed from 1/4" thick steel and fully boxed, providing significantly more strength and rigidity than factory arms.

Do they require regular maintenance?
No. The OE-style rubber bushings are maintenance-free and designed for long service life with no greasing required.