Fabtech K2158DL

2011–2013 Ford F450/550 4WD 10-Lug

Part #: K2158DL

Overview

The Fabtech 6-inch Rad Arm System with Dirt Logic 4.0 Coilover and Rear DLSS is a high-performance suspension upgrade designed specifically for Ford F450 and F550 Super Duty trucks from 2011 to 2013. Engineered to maximize front suspension damping and improve overall ride quality, this system is ideal for off-road enthusiasts, heavy-duty work applications, and those seeking enhanced stability and control on challenging terrains.

By replacing the factory coil spring mounts with robust, high-quality components, this coilover conversion system ensures your vehicle can handle demanding impacts while maintaining precise handling. The system's durable construction and advanced design deliver a significant upgrade over stock suspension, providing increased wheel travel, improved load support, and a smoother ride both on and off the pavement.

Key Features

The Fabtech Rad Arm System incorporates several innovative features to enhance your truck’s performance and durability:

• Constructed with 1.75-inch diameter DOM tubing for the upper coilover mounts, offering superior strength and impact load distribution across the frame for enhanced durability and longevity.
• Heavy-duty 1/4-inch thick steel lower mounts attach securely to the axle housing, providing solid mounting points for the Dirt Logic 4.0 stainless steel coilover shocks.
• Designed with a wide span across the frame to evenly distribute impact loads, reducing stress on critical suspension components and improving overall stability.
• Includes high-quality stainless steel coilover shocks with piggyback reservoirs, delivering consistent damping performance under heavy loads and rough terrain conditions.
• Optimized for maximum front suspension travel, allowing your truck to navigate obstacles with confidence and minimal body roll.
• Built with corrosion-resistant materials to withstand harsh off-road environments and prolonged exposure to the elements.
• Compatible with factory mounting points, ensuring a straightforward bolt-on installation without the need for extensive modifications.
• Designed to support increased load capacity and improve handling for both daily driving and off-road adventures.

Construction & Design

The Fabtech Rad Arm System features a meticulously engineered design that combines strength, flexibility, and durability. The upper coilover mounts are crafted from 1.75-inch diameter DOM (Drawn Over Mandrel) tubing, which provides exceptional strength and impact resistance. These mounts span across a broad section of the frame, effectively distributing impact loads and reducing stress concentrations that can lead to component failure.

The lower mounts are made from 1/4-inch thick steel, ensuring a solid connection to the axle housing. This robust construction enhances the overall stability of the suspension system, especially under heavy loads or aggressive off-road conditions. The stainless steel coilover shocks with piggyback reservoirs are engineered for consistent damping performance, helping to absorb bumps, jumps, and rough terrain impacts while maintaining precise control.

The system's design emphasizes ease of installation, with all components engineered to fit seamlessly with the factory mounting points. The use of corrosion-resistant materials ensures longevity and reliable performance in demanding environments. Overall, the system provides a significant upgrade over stock suspension, offering improved ride quality, handling, and off-road capability.

Performance & Sound

The Fabtech 6-inch Rad Arm System with Dirt Logic 4.0 shocks is built to deliver superior damping and impact absorption, resulting in a smoother ride and enhanced control. The high-quality stainless steel shocks provide consistent damping performance, reducing body roll and improving steering response during spirited driving or off-road excursions. While specific horsepower or torque gains are not claimed, users can expect improved suspension responsiveness, better wheel articulation, and increased load support, making your truck more capable in challenging conditions.

Installation & Fitment

This coilover conversion system is designed as a bolt-on upgrade for 2011–2013 Ford F450 and F550 4WD trucks with 10-lug wheels. The installation process involves replacing the factory coil spring mounts with the provided Rad Arm components and mounting the Dirt Logic 4.0 shocks. No cutting, drilling, or extensive modifications are typically required, and the system is engineered for a straightforward installation using standard tools. Proper alignment is recommended after installation to ensure optimal handling and tire wear.

• Includes all necessary brackets, mounts, and hardware for a complete installation.
• Designed for off-road enthusiasts and heavy-duty users seeking maximum suspension performance.
• Supports increased wheel travel and load capacity for demanding applications.

What's Included

• Rad Arm System upper coilover mounts (constructed from 1.75" DOM tubing)
• Lower steel mounts (1/4" thick steel)
• Stainless steel Dirt Logic 4.0 coilover shocks with piggyback reservoirs
• All necessary hardware and mounting brackets
• Installation instructions

Ideal For

• Off-road enthusiasts seeking maximum suspension travel and impact absorption
• Heavy-duty work trucks requiring enhanced load support and stability
• Drivers looking to improve handling and ride quality on challenging terrains
• Custom suspension upgrades for Ford Super Duty trucks from 2011 to 2013