Fabtech Radius Arm System

2008–2016 Ford F350/F450 4WD 8-Lug

Part #: K2131M

Overview

The Fabtech 6" Radius Arm System with Coils & Stealth is a comprehensive suspension upgrade designed specifically for Ford F350 and F450 trucks from 2008 to 2016. Engineered to deliver exceptional off-road capability, improved ride height, and enhanced durability, this system is ideal for enthusiasts seeking to push their heavy-duty trucks beyond factory limits. Whether you're tackling rugged terrain, towing heavy loads, or looking to elevate your vehicle's stance, this kit provides the performance and reliability you need.

Built with quality and precision in mind, the Fabtech Radius Arm System offers a significant lift while maintaining excellent handling and stability. The system's design ensures a smooth, controlled ride both on and off-road, making it suitable for daily driving, off-road adventures, or heavy-duty work applications. With its robust construction and thoughtful features, you'll get a reliable upgrade that supports your truck's performance and appearance.

Key Features

The Fabtech Radius Arm System incorporates several innovative features that set it apart from standard suspension kits:

• Full tubular radius arms reinforced with dimple die side plates provide increased strength and durability, ensuring long-lasting performance under demanding conditions.
• An adjustable alignment cam at the axle allows for precise caster adjustments, helping to optimize steering geometry and tire wear for improved handling and stability.
• Front spring lift options include 6-inch replacement coil springs, designed to provide the desired lift height while maintaining ride quality and load-carrying capacity.
• A comprehensive package includes a trac bar relocation bracket, Pitman arm, sway bar drops, and a rear block & u-bolt kit, ensuring proper alignment and suspension geometry after installation.
• Manufactured in the United States, this system adheres to high-quality standards, offering reliable performance and fitment.
• Designed specifically for 8-lug 4WD models, ensuring a perfect fit and seamless integration with your truck's existing components.
• Heavy-duty components and precise engineering help support increased payloads, towing capacity, and off-road excursions.

Construction & Design

The Fabtech Radius Arm System features a robust construction built to withstand the rigors of off-road driving and heavy-duty use. The radius arms are crafted from full tubular steel, providing superior strength compared to traditional stamped or welded arms. The dimple die side plates add additional reinforcement, reducing flex and increasing longevity.

The system's design emphasizes precise geometry and durability. The adjustable cam at the axle allows for caster adjustments, which are critical for steering response and tire wear. The included coil springs are engineered to provide a 6-inch lift, balancing height with ride comfort. All components are engineered for easy installation, with many parts designed to reuse factory mounting points, minimizing modification time.

Performance & Sound

This suspension upgrade significantly enhances your truck's off-road capability and overall ride quality. The increased ground clearance allows for better obstacle clearance and approach/departure angles. The reinforced radius arms and heavy-duty components support increased payload and towing demands, giving you confidence in demanding conditions.

While primarily focused on performance and durability, the system also improves handling stability during off-road maneuvers and heavy loads. The design helps reduce body roll and provides a more controlled ride, whether you're on rugged trails or hauling heavy loads.

Installation & Fitment

The Fabtech Radius Arm System is a bolt-on upgrade designed for straightforward installation. Most components are engineered to reuse factory mounting points, reducing the need for extensive modifications. Basic mechanical skills and standard tools are sufficient for installation, but professional alignment is recommended afterward to ensure optimal handling and tire wear.

No cutting, drilling, or extensive fabrication is required, making this a manageable upgrade for experienced DIY enthusiasts or professional installers. The system is specifically designed for 2008–2016 Ford F350 and F450 4WD trucks with 8-lug wheels, ensuring a perfect fit and seamless integration with your vehicle's existing suspension components.

What's Included

• Full set of tubular radius arms with reinforced dimple die side plates
• 6-inch replacement coil springs for front lift
• Trac bar relocation bracket
• Pitman arm
• Sway bar drop brackets
• Rear block and u-bolt kit
• All necessary hardware and mounting components
• Installation instructions

Ideal For

• Off-road enthusiasts seeking increased ground clearance and suspension durability
• Heavy-duty truck owners who need reliable lift and load support
• Customizers aiming for a commanding stance and improved handling
• Anyone looking to upgrade their Ford F350/F450 for towing, hauling, or off-road adventures

Emissions Note

This suspension system is designed for off-road use and may not be emissions compliant in all regions. Please verify local regulations before installation. This product is not CARB-approved and is intended for off-road or recreational use only.