Fabtech Radius Arm System

2017–2021 Ford F250/F350 4WD Diesel

Part #: K2215M

Overview

The Fabtech 4" Radius Arm System with Coils & Stealth shocks is a comprehensive suspension upgrade designed specifically for 2017–2021 Ford F250 and F350 4WD diesel trucks. Engineered to enhance off-road capability, improve ride quality, and support increased lift, this system is ideal for enthusiasts seeking a durable and reliable solution for heavy-duty applications. Whether you're tackling rugged terrain or looking to elevate your truck's stance for a more commanding presence, this kit provides the performance and versatility you need.

Featuring a full tubular radius arm design with dimple die side plates, the system offers superior strength and durability. The adjustable alignment cam at the axle allows for precise caster adjustments, ensuring optimal handling and tire wear. The included front spring lift options utilize 6-inch replacement coil springs, providing a significant lift while maintaining ride comfort. Completing the setup are high-quality components such as a trac bar relocation bracket, Pitman arm, sway bar drops, and a rear block & u-bolt kit, all engineered to work seamlessly together for a smooth, stable ride.

Key Features

Fabtech's Radius Arm System is built with performance and longevity in mind, incorporating advanced design and high-quality materials to deliver a superior suspension upgrade. Key features include:

• Heavy-duty tubular radius arms with dimple die side plates for enhanced strength and durability under demanding conditions.
• Adjustable alignment cam at the axle for precise caster adjustment, improving steering response and tire wear.
• 6-inch replacement coil springs designed to provide reliable front lift while maintaining ride quality and load-carrying capacity.
• Complete front and rear suspension components, including sway bar drops, trac bar relocation bracket, and rear block & u-bolt kit, ensuring proper geometry and alignment after lift installation.
• Stealth shocks included in the kit, offering a balance of off-road performance and on-road comfort with a sleek appearance.
• Manufactured in the USA, ensuring quality craftsmanship and adherence to strict standards.

Construction & Design

The Fabtech Radius Arm System features a robust tubular construction for the radius arms, providing exceptional strength and resistance to bending or fatigue. The dimple die side plates add structural reinforcement, ensuring the arms can withstand heavy loads and off-road impacts. The coil springs are engineered for optimal lift and ride comfort, with a focus on maintaining factory-like handling characteristics. The included Stealth shocks are designed with durable components and a sleek black finish, blending performance with style. All components are precisely engineered using CAD technology to ensure perfect fitment and seamless integration with your truck's existing suspension geometry.

Performance & Sound

This suspension upgrade significantly improves off-road capability by increasing ground clearance and wheel travel, allowing your truck to handle rough terrain with confidence. The adjustable caster cam ensures proper alignment, which enhances steering response and reduces tire wear. The upgraded shocks provide improved damping, resulting in a smoother ride both on and off the pavement. While this system is primarily designed for performance and durability, you may notice a more commanding stance and a slight increase in suspension noise during aggressive driving, typical of high-performance off-road setups.

Installation & Fitment

The Fabtech Radius Arm System is a bolt-on upgrade that requires no cutting or welding, making it accessible for experienced DIY enthusiasts and professional installers alike. The kit is designed to fit directly onto your 2017–2021 Ford F250/F350 4WD diesel trucks, restoring proper suspension geometry after lifting. Basic hand tools and a lift or jack stands are recommended for installation. It is advisable to have the alignment checked and adjusted after installation to ensure optimal handling and tire wear.

• Designed for 2017–2021 Ford F250 and F350 4WD diesel models.
• No cutting, drilling, or welding required for installation.
• Complete bolt-on system with all necessary hardware included.

What's Included

• Front radius arms with adjustable caster cam
• 6-inch replacement coil springs
• Stealth shocks (front and rear)
• Trac bar relocation bracket
• Pitman arm
• Sway bar drop brackets
• Rear block & 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 needing reliable suspension support for towing and hauling
• Custom truck builders aiming for a durable, high-performance lift kit
• Drivers wanting to improve stance and appearance of their Ford F250/F350

Emissions Note

This suspension system is designed for off-road use and may not be street-legal in all areas. Please check local regulations before installation. This kit does not affect emissions compliance and is intended for use in off-road applications only.