Fabtech Radius Arm Kit
2019–2021 Ram 2500 / 2020 Ram 3500
K3180DL
Overview:
The Fabtech Radius Arm Kit is a comprehensive suspension upgrade designed specifically for Ram 2500 models from 2019 to 2021 and Ram 3500 models from 2020. This kit enhances the factory suspension system by incorporating Fabtech’s signature tubular radius arms, engineered to improve caster angles and accommodate oversized tires and lifted suspension setups. Ideal for truck owners seeking a smoother ride without sacrificing load-carrying capability, this kit addresses the harsh factory coil spring design by introducing a patented straight coil spring system for improved ride quality and suspension performance.
Whether you’re upgrading for off-road capability, towing, or daily driving comfort, the Fabtech Radius Arm Kit delivers a balanced solution that maintains factory strength and durability while enhancing handling and ride comfort.
Key Features:
This Fabtech Radius Arm Kit combines innovative engineering with durable materials to optimize your Ram’s suspension performance. Key features include:
- Fabtech’s trademark tubular radius arms with dimple die side plates for superior strength and increased caster adjustment.
- Front straight coil springs paired with Fabtech’s patented angular spring mounts, eliminating the factory coil bow for a smoother, more controlled ride.
- Heavy-duty 1/4" thick steel front and rear track bar drop brackets to properly center axles under the vehicle at lifted heights.
- Dual-rate rear coil springs that provide a comfortable highway ride while maintaining heavy load capacity.
- Exclusive heavy-duty steel front bump stop extensions that retain factory bump stop cushions for progressive damping and prevent suspension overtravel.
- Compatibility with large tire sizes up to 37 inches with minor trimming required.
- Designed to maintain factory load carrying capacity and suspension geometry for optimal performance.
Construction & Design:
Fabtech’s Radius Arm Kit is built with rugged, high-strength materials engineered for durability and performance. The tubular radius arms feature dimple die side plates, a hallmark of Fabtech’s quality, providing enhanced rigidity and resistance to bending or flexing under heavy loads. The front coil springs utilize a straight vertical design, a significant improvement over the factory’s bowed coil springs, achieved through Fabtech’s patented angular spring mounts that modify the lower spring seat. This design reduces spring rate harshness while preserving load capacity, resulting in a more compliant and controlled ride.
All steel components, including the track bar drop brackets and bump stop extensions, are fabricated from thick, heavy-duty steel to withstand the rigors of lifted suspension use and off-road conditions. The kit’s engineering ensures proper axle alignment and suspension travel, maintaining factory geometry and handling characteristics.
Installation & Fitment:
The Fabtech Radius Arm Kit is designed for direct fitment on Ram 2500 models from 2019 through 2021 and Ram 3500 models from 2020. It is compatible with Big Horn, Laramie, Laramie Longhorn, Limited, Lone Star, Power Wagon (Ram 2500 only), Tradesman, and SLT trims within these years. Note that this kit does not fit standard cab models, gas engine variants, factory air suspension setups, or Power Wagon models beyond 2020.
Installation requires minor trimming to accommodate larger tires up to 37 inches on 17x9, 18x9, or 20x9 wheels with a 5-inch backspacing. The kit includes all necessary components for a complete lift and suspension upgrade, and professional installation is recommended to ensure proper alignment and performance.
What's Included:
- Fabtech tubular radius arms with dimple die side plates
- Front straight coil springs with patented angular spring mounts
- Dual-rate rear coil springs
- Heavy-duty front and rear track bar drop brackets
- Heavy-duty steel front bump stop extensions
- All necessary hardware and mounting components
Ideal For:
This Radius Arm Kit is ideal for Ram 2500 and 3500 owners who require a suspension upgrade that balances off-road capability, load carrying, and ride comfort. It suits those running oversized tires and lifted suspensions who want to maintain proper suspension geometry and handling. Whether used for heavy towing, hauling, or daily driving, this kit enhances ride quality while preserving the truck’s factory strength and durability.
