Fabtech Radius Arm System with Dirt Logic Shocks

2013–2016 Ram 3500 4WD with Factory Radius Arms

K3071DL

Overview:

The Fabtech 5-inch Radius Arm System with Dirt Logic Stainless Steel Shocks is a premium suspension upgrade designed specifically for 2013 to 2016 Ram 3500 trucks equipped with factory radius arms. This system enhances the front suspension by replacing the stock radius arms with heavy-duty tubular arms featuring Fabtech’s exclusive dimple die side plates for superior strength and durability. It is engineered to provide increased caster angle, which is essential for maintaining proper alignment and handling when running oversized tires and lifted suspension setups.

Fabtech’s design retains the factory coil spring bow using angular steel spacers, preserving the Ram’s unique ride quality and alignment specifications. The system also includes a robust front track bar drop bracket and steel bump stop extensions to protect suspension components from damage. Paired with front and rear 2.25-inch Dirt Logic stainless steel shocks, this kit delivers improved ride control and off-road capability.

Key Features:

This comprehensive radius arm system offers a range of features tailored for lifted Ram 3500 trucks:

• 5-inch suspension lift with replacement tubular radius arms featuring dimple die side plates for enhanced strength
• Increased caster angle for improved steering geometry with oversized tires
• Angular steel spacers maintain factory coil spring bow for optimal ride quality
• Heavy-duty 1/4-inch thick steel front track bar drop bracket centers the axle under the vehicle
• Fabtech steel front bump stop extensions prevent damage to springs and shocks, outperforming urethane bump stops
• Rear suspension block and u-bolt system with bump stop extensions included
• Includes front and rear 2.25-inch Dirt Logic stainless steel shocks for superior damping and durability
• Compatible with tires up to 37 inches tall with minor trimming
• No welding required; installation involves drilling 10 holes

Construction & Design:

Fabtech’s radius arms are constructed from high-strength tubular steel, reinforced with exclusive dimple die side plates that add rigidity and a rugged aesthetic. The angular steel spacers used to mount the stock coil springs preserve the factory spring bow, a critical design element that Chrysler incorporated to maintain precise alignment and ride comfort. Unlike flat spacers, these angular spacers ensure the suspension geometry remains true to factory specifications.

The front track bar drop bracket is fabricated from 1/4-inch thick steel, engineered to reposition the axle correctly under the lifted chassis. Fabtech’s innovative steel bump stop extensions replace fragile urethane stops, providing a durable solution that prevents spring and shock damage during off-road articulation or heavy compression.

Installation & Fitment:

Installation of the Fabtech 5-inch Radius Arm System is straightforward for experienced technicians, with an estimated time of approximately 4.5 hours. The process requires drilling 10 holes but does not involve any welding, making it accessible for most professional shops or skilled DIY installers. Minor trimming of the wheel wells may be necessary to accommodate 37-inch tires depending on wheel size and offset.

This system is designed exclusively for 2013 to 2016 Ram 3500 4WD models equipped with factory radius arms. It is compatible with the following trims: Big Horn (2013–2015), Laramie (2013–2016), Laramie Limited (2014–2015), Laramie Longhorn (2013–2016), Lone Star (2013–2015), SLT (2013–2016), ST (2013), and Tradesman (2013–2016). Note that this kit will not fit trucks equipped with factory air suspension.

What's Included:

• Set of 5-inch tubular radius arms with dimple die side plates
• Angular steel coil spring spacers
• 1/4-inch thick steel front track bar drop bracket
• Steel front bump stop extensions
• Rear suspension block and u-bolt kit with bump stop extensions
• Front and rear 2.25-inch Dirt Logic stainless steel shocks
• All necessary hardware for installation (bolts, nuts, washers)
• Installation instructions

Ideal For:

This Fabtech Radius Arm System is ideal for Ram 3500 owners seeking a reliable, heavy-duty suspension upgrade to support lifted setups and oversized tires up to 37 inches. It is perfect for off-road enthusiasts, work truck operators, and anyone looking to improve front suspension strength, alignment, and ride quality without sacrificing factory ride characteristics. The included Dirt Logic shocks provide enhanced damping for both on- and off-road driving conditions, making this system a balanced choice for daily drivers and trail riders alike.

Fabtech is an off-road suspension leader producing lift kits, shocks, and related components to increase ride height, clear larger tires, and improve capability. Their systems are engineered for specific trucks and SUVs, blending on-road drivability with the added travel and strength enthusiasts want for trails, desert runs, and overland builds.