Fabtech 4in Radius Arm System

2017–2021 Ford F250/F350 4WD Diesel

Part #: K2215

Overview

The Fabtech 4in Radius Arm System with Coils & Performance Shocks is a comprehensive suspension upgrade designed specifically for Ford F250 and F350 4WD Diesel trucks from 2017 to 2021. Engineered to enhance off-road capability, improve ride quality, and provide a commanding stance, this system is ideal for enthusiasts who demand durability and performance from their heavy-duty pickup.

This kit features a patented radius arm design that offers superior strength and stability. The full tubular structure, reinforced with dimple die side plates, ensures long-lasting durability even under demanding conditions. The adjustable alignment cam at the axle allows for precise caster adjustments, helping you achieve optimal alignment and handling characteristics. The system also includes front spring lift options with 6-inch replacement coil springs, providing additional ground clearance for off-road adventures or larger tires.

Key Features

Designed with performance and reliability in mind, the Fabtech Radius Arm System offers several key features:

• Heavy-duty tubular radius arms with dimple die side plates for maximum strength and durability.
• Adjustable alignment cam at the axle for precise caster and alignment adjustments, ensuring proper handling and tire wear.
• Front lift provided by 6-inch replacement coil springs, increasing ground clearance and allowing for larger tires.
• Complete system includes a Trac Bar relocation bracket to maintain steering stability and reduce axle wrap during off-road use.
• Pitman arm and sway bar drop brackets included to restore factory steering geometry and improve handling.
• Rear block and U-bolt kit for proper axle positioning and ride height adjustment.
• Performance shocks included for improved damping, ride comfort, and off-road capability.
• Patented design with a focus on strength, longevity, and ease of installation.
• Made in the USA, ensuring quality craftsmanship and materials.

Construction & Design

The Fabtech Radius Arm System is constructed from high-strength tubular steel, providing exceptional durability and resistance to bending or cracking under heavy loads. The dimple die side plates add reinforcement to critical stress points, further enhancing the system's robustness. The adjustable cam at the axle allows for fine-tuning of caster angles, which is essential for maintaining proper steering response and tire wear over time.

The front coil springs are engineered to provide a 6-inch lift, crafted from high-quality steel to ensure consistent performance and longevity. The included shocks are performance-tuned to absorb impacts from rough terrain, delivering a smoother ride both on and off-road. The rear block and U-bolt kit are designed to maintain proper axle alignment and ride height after lifting, ensuring a balanced and stable stance.

Performance & Sound

This suspension system significantly improves off-road capability by increasing ground clearance and wheel travel. The upgraded shocks enhance ride comfort and handling, reducing body roll and absorbing bumps more effectively. While specific horsepower or torque gains are not claimed, the system supports larger tires and more aggressive off-road driving, helping your truck perform confidently in challenging conditions.

Installation & Fitment

The Fabtech Radius Arm System is a bolt-on upgrade that is designed for straightforward installation with standard tools. No cutting or welding is required, and the system is engineered to fit directly onto your truck's factory mounting points. Some alignment adjustment may be necessary after installation to ensure optimal handling and tire wear. It is recommended to have a professional alignment performed once the lift is installed to achieve the best results.

• Includes all necessary components for a complete installation, such as radius arms, coil springs, shocks, brackets, and hardware.
• Designed specifically for 2017–2021 Ford F250 and F350 4WD Diesel models.
• Compatible with factory or aftermarket wheels and tires, depending on lift and clearance.

What's Included

• Front tubular radius arms with dimple die reinforcement
• 6-inch replacement coil springs
• Performance shocks (front and rear)
• Trac Bar relocation bracket
• Pitman arm and sway bar drop brackets
• Rear block and U-bolt kit
• All necessary mounting hardware and instructions

Ideal For

• Off-road enthusiasts seeking increased ground clearance and wheel travel
• Heavy-duty truck owners who require a durable suspension upgrade for towing or hauling
• Performance-minded drivers wanting improved handling and ride quality
• Those looking to fit larger tires for a more aggressive appearance and enhanced off-road capability

Emissions Note

This product is designed for off-road use and may not be legal for street use in all areas. Please check local regulations regarding emissions compliance before installation.