Fabtech Radius Arm Kit: Ram 2500 (2019-2021) / 3500 (2020) w/ Stealth

Fabtech Radius Arm Kit

2019–2021 Ram 2500 / 2020 Ram 3500

K3180M

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 geometry by replacing the stock radius arms with Fabtech’s signature tubular radius arms, engineered for superior strength and improved caster angle. Ideal for enthusiasts looking to run oversized tires and lifted suspension setups, this kit delivers a smoother, more controlled ride without compromising load-carrying capacity.

Fabtech’s innovative coil spring design addresses the harsh ride and nervous suspension feel common in stock Ram front suspensions. By replacing the factory bowed coil springs with straight vertical coils mounted on patented angled spring seats, the kit provides a more supple ride quality while maintaining the vehicle’s heavy-duty performance. The rear suspension benefits from a dual-rate coil spring setup that balances comfort and load handling for everyday driving and heavy hauling.

Key Features:

This Radius Arm Kit combines advanced engineering and durable materials to optimize suspension performance and vehicle handling. Key features include:

• Fabtech’s trademark tubular radius arms with dimple die side plates for enhanced strength and increased caster angle
• Front straight coil springs paired with patented angled spring mounts to eliminate spring bow and reduce harshness
• 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 smooth highway ride and progressive support under heavy loads
• Fabtech-exclusive heavy-duty steel front bump extensions that retain factory bump stop cushions for progressive damping and prevent suspension overtravel
• Compatibility with 37-inch tires on 17", 18", and 20" wheels with minor trimming
• Designed to maintain factory load carrying capacity and suspension geometry for lifted Ram 2500 and 3500 trucks

Construction & Design:

Fabtech’s Radius Arm Kit is built with rugged, high-strength materials to withstand the demands of lifted and off-road Ram trucks. The tubular radius arms feature dimple die side plates, a hallmark of Fabtech’s quality and engineering, providing superior rigidity and durability compared to stock components. The coil springs are redesigned with a straight vertical configuration, supported by Fabtech’s patented angular spring mounts that modify the lower spring seat without altering the factory mounting points. This design innovation reduces spring bow, allowing for a lower spring rate and improved ride comfort without sacrificing load capacity.

Steel track bar drop brackets are fabricated from 1/4" thick steel to ensure precise axle alignment at increased ride heights. The front bump extensions are crafted from heavy-duty steel to preserve the factory bump stop cushions, offering progressive suspension damping and preventing suspension overtravel under extreme conditions.

Installation & Fitment:

The Fabtech Radius Arm Kit is engineered for direct fitment on select Ram 2500 and 3500 models, requiring minor trimming for optimal tire clearance when running 37-inch tires on 17", 18", or 20" wheels with a 5" backspacing. Installation involves replacing the factory radius arms, coil springs, and track bar brackets, along with mounting the patented angled spring seats. The kit is designed to work with the factory coil spring seats and bump stops, preserving the original suspension characteristics while improving ride quality and performance.

Note that this kit does not fit standard cab models, vehicles with factory air suspension, gas engine variants, or Power Wagon models beyond 2020.

What's Included:

• Fabtech tubular radius arms with dimple die side plates
• Front straight coil springs with patented angled spring mounts
• Dual-rate rear coil springs
• Heavy-duty 1/4" steel front and rear track bar drop brackets
• Heavy-duty steel front bump extensions
• All necessary hardware for installation

Ideal For:

This Radius Arm Kit is perfect for Ram 2500 and 3500 owners who want to upgrade their suspension for lifted applications with oversized tires while maintaining factory load capacity and improving ride comfort. It is especially suited for off-road enthusiasts, heavy-duty truck users, and anyone seeking enhanced suspension geometry and durability without sacrificing daily drivability.