Fabtech K2143DL

2011–2016 Ford F250/F350 4WD

Part #: K2143DL

Overview

The Fabtech 8" Radius Arm System with DLSS 4.0 Coilover & Rear Leaf Springs is a comprehensive suspension upgrade designed specifically for Ford F250 and F350 4WD trucks from 2011 to 2016. This system is engineered to maximize front suspension damping and improve off-road capability, making it ideal for enthusiasts who demand durability, performance, and enhanced ride quality. Whether you're tackling rugged trails, hauling heavy loads, or seeking a commanding stance, this kit provides the strength and adjustability needed to elevate your Super Duty's performance.

By replacing the factory suspension components with high-quality, heavy-duty parts, this system ensures your truck can handle challenging terrains while maintaining excellent stability and control. The combination of radius arms, coilovers, and rear leaf springs delivers a significant lift and improved suspension travel, allowing for larger tires and better articulation. You'll experience a more confident ride, improved impact absorption, and a commanding presence on and off the road.

Key Features

This Fabtech suspension system incorporates advanced engineering and premium materials to deliver superior performance and longevity. Key features include:

• Heavy-duty 1.75" diameter DOM steel tubing for the upper coilover mounts, providing robust support and impact load distribution across the frame for enhanced durability.
• Reinforced lower mounts made from 1/4" thick steel, ensuring solid attachment points to the axle housing for reliable performance under heavy loads and off-road conditions.
• Stainless Steel Dirt Logic 4.0 Coilover shocks with piggyback reservoirs, offering adjustable damping for superior ride quality and control in various terrains.
• Custom-designed radius arms that maintain proper caster and alignment angles, improving steering response and reducing wear over time.
• Rear leaf springs engineered for increased load capacity and ride height, complementing the front suspension lift for a balanced stance and improved off-road articulation.
• Precision CNC-machined components and TIG welding throughout the system, ensuring high-quality fitment and long-lasting strength.
• Designed for easy bolt-on installation with minimal modifications required, allowing for a straightforward upgrade process.

Construction & Design

The Fabtech 8" Radius Arm System is built with durability and performance in mind. The upper coilover mounts are constructed from 1.75" DOM tubing, a high-strength material that resists bending and impact damage. These mounts span across a wide section of the frame, effectively distributing impact loads and reducing stress concentrations. The lower mounts are crafted from 1/4" steel plate, providing a sturdy foundation for the coilover shocks and ensuring reliable operation under demanding conditions.

The coilover shocks feature stainless steel construction with piggyback reservoirs, which help dissipate heat and maintain consistent damping performance during extended off-road use. The radius arms are designed with precise geometry to retain factory steering and alignment characteristics, preventing premature wear and ensuring predictable handling. The rear leaf springs are engineered to support increased load capacities and maintain proper ride height, contributing to a balanced and aggressive stance.

All components are TIG-welded and CNC-machined for precision fitment and maximum strength. The system's design emphasizes impact load distribution, corrosion resistance, and ease of installation, making it a reliable upgrade for serious off-road enthusiasts and daily drivers alike.

Performance & Sound

This suspension system significantly enhances your truck's off-road capability by increasing ground clearance, improving suspension travel, and providing adjustable damping for a smoother ride over rough terrain. The upgraded coilovers and leaf springs work together to support larger tires and better articulation, allowing your vehicle to conquer challenging obstacles with confidence. While this kit does not specifically claim horsepower gains, the improved suspension response and impact absorption translate to better overall vehicle control and stability.

The system also contributes to a more commanding stance and a slight increase in ride height, giving your truck a more aggressive look. The stainless steel coilovers produce a subtle, deep tone during compression and rebound, adding to the vehicle's off-road presence without excessive noise or vibration.

Installation & Fitment

The Fabtech 8" Radius Arm System is designed as a bolt-on upgrade, utilizing existing factory mounting points and hardware where possible. The installation process typically requires basic mechanical skills and standard tools; however, some alignment adjustments may be necessary afterward to ensure proper handling and tire wear. No cutting, drilling, or extensive modifications are generally required, making this system suitable for DIY enthusiasts and professional installers alike.

For optimal performance, a professional wheel alignment is recommended after installation to restore factory specifications and maximize suspension longevity.

What's Included

• Front radius arm assembly with heavy-duty 1.75" DOM steel tubing
• Stainless Steel Dirt Logic 4.0 Coilover shocks with piggyback reservoirs
• Rear leaf springs designed for increased load capacity and ride height
• All necessary mounting hardware and brackets
• Installation instructions and technical support

Ideal For

• Off-road enthusiasts seeking maximum suspension travel and durability
• Heavy-duty towing and hauling applications
• Lifted truck owners wanting a commanding stance and improved ground clearance
• Daily drivers who require a reliable, high-performance suspension upgrade