Cognito SM Series Radius Arm Kit

The Cognito SM Series Radius Arm Kit is designed for Ford Super Duty owners who want a stronger, better-looking radius arm upgrade with improved adjustability and suspension performance. Built for select 2005–2022 Ford F-250/F-350 4WD trucks and 2017–2019 Ford F-450 4WD models, this kit replaces the factory radius arms with Cognito’s off-road styled boxed sheet metal design.

Built from heavy-duty boxed sheet metal construction, the Cognito SM Series Radius Arm Kit delivers durability, performance, and a signature Cognito appearance. The design focuses on quick, precise caster adjustment, making it ideal for trucks running larger tires, suspension upgrades, or Cognito lift systems.

Additional features include complete driver- and passenger-side radius arms, clevis and rod end assemblies, pivot bushings, misalignment spacers, and required mounting hardware. The kit is finished in semi-gloss black powder coat and includes everything needed for installation.

Engineered with vehicle-specific fitment, this radius arm kit provides a clean, integrated installation that complements factory styling while improving adjustability and suspension geometry.

Installation is a direct replacement-style process, but Cognito specifies that installation requires a qualified mechanic and a lift, making professional installation strongly recommended.

Whether you're upgrading for improved caster adjustment, lifted-truck performance, larger tire clearance, or a more aggressive suspension appearance, the Cognito SM Series Radius Arm Kit delivers heavy-duty construction, precise adjustability, and premium Cognito styling. Now Available at LEER!

Features & Specifications

Product Type: Radius Arm Kit
Brand: Cognito
Series: SM Series
Material: Heavy-duty boxed sheet metal construction
Finish Options: Semi-gloss black powder coat
Mounting Type: Direct replacement for OEM radius arms
Fitment:

• 2005–2022 Ford F-250/F-350 4WD
• 2017–2019 Ford F-450 4WD

Design: Off-road styled boxed sheet metal radius arm design
Shipping Weight: 78 lb
Functionality:

• Adjustable caster
• Improved front suspension geometry
• Enhanced ground clearance
• Larger tire drivability support
• Direct OEM radius arm replacement

Available Options

The Cognito SM Series Radius Arm Kit is available for:

Vehicle Fitments

• 2005–2022 Ford F-250 4WD
• 2005–2022 Ford F-350 4WD
• 2017–2019 Ford F-450 4WD

Finish Options

• Semi-gloss black powder coat

Configurations

• Driver- and passenger-side complete radius arm kit
• Compatible with select Cognito 6 in. and 8 in. lift setups when used with the appropriate short radius arm drop bracket

Choose this kit for compatible Ford Super Duty applications where adjustable caster, heavy-duty construction, and Cognito styling are priorities.

Why Choose the Cognito SM Series Radius Arm Kit?

This product is ideal for customers who want a stronger, more adjustable replacement for factory radius arms.

• Heavy-duty construction supports demanding truck suspension use
• Adjustable caster helps improve street drivability with larger tires
• Direct replacement design provides clean installation in place of OEM radius arms
• Improved ground clearance benefits lifted and off-road-focused builds
• Signature Cognito styling adds a premium performance appearance

What’s Included

• Driver-side FSD radius arm
• Passenger-side FSD radius arm
• Driver-side radius arm clevis and rod end
• Passenger-side radius arm clevis and rod end
• FSD radius arm pivot bushing kit
• FSD radius arm hardware
• Rod ends
• Misalignment spacers
• Crush sleeves
• Poly bushings
• Required mounting hardware
• Installation instructions

Installation Notes

• Designed as a direct replacement for OEM radius arms
• Installation requires a qualified mechanic
• A lift is required to perform installation safely
• Vehicle must be properly supported before installation
• Caster adjustment can be made on the truck without disassembling components
• Adjustment is located at the lower axle mount to help prevent the axle and tires from being
• pulled rearward during adjustment
• Installer should follow OEM torque specifications when reusing factory fasteners
• Professional installation is recommended

Warranty Information

Cognito Warranty

Cognito suspension products are backed by a limited lifetime warranty for the original retail purchaser, covering defects in workmanship and materials for as long as the purchaser owns the vehicle on which the product was originally installed.