Ford F250/F350 Super Duty 2023-2026 4WD FTS-X Radius Arm Kit (for 2.5" to 6" lifts) by Fabtech

Fabtech’s FTS22390 FTS-X Series Radius Arms transform the Ford F250/F350 models with a suspension upgrade that balances daily comfort with serious off-road control. Whether you’re towing on the interstate or picking your way through washboards and ruts, FTS-X refines steering feel, increases usable wheel travel, and opens up tire room—without giving up the confident road manners that make the F-250 and F-350 so capable from the factory.

Engineered Upgrade for Lifted Trucks

At the core of the system are FTS-X adjustable radius arms designed specifically for 2.5″, 4″, and 6″ lift heights. These arms directly replace the stock radius arms and add an adjustable lower link that eliminates bind through the arc of travel. That adjustability allows you to set a preferred caster profile for straight-line stability and a crisp return-to-center with larger tires. Compared to fixed-length arms, the FTS-X design unlocks noticeably better articulation at trail speeds and remains composed at highway pace. Fabtech pre-installs HD uniballs at the OE frame pivots for tight, precise motion, and uses FK rod ends on the adjustable lower link to handle heavy loads and repeated impacts.

Strength, Clearance & Control

The upper and lower tubes are constructed from 1.75″ OD x 0.120″ wall DOM steel and are fully welded to withstand commercial duty and harsh environments. Arm geometry is offset and positioned inboard relative to stock, which preserves full steering lock with a 13.50-wide tire on a 5″ backspacing wheel. The result is a front end that tracks true, resists wander, and cycles smoothly through bump and droop without the binding that can plague lifted trucks.

Top Features and Benefits

• Direct-replace radius arms engineered for lifted 2.5", 4", and 6" setups—no guesswork.
• Adjustable lower link eliminates bind and lets you set a preferred caster profile for straight-line stability and crisp on-center feel.
• Articulation upgrade: Outperforms fixed-length arms for better terrain compliance at all speeds.
• HD Uniballs pre-installed at the OE frame mounts plus FK rod-end hardware on the adjustable lower link for precise, durable motion.
• DOM construction: Upper and lower tubes use 1.75" OD x .120" wall DOM; fully welded for strength and corrosion resistance.
• Offset, inboard positioning allows full steering lock with a 13.50-wide tire on a 5" backspace wheel.
• Daily comfort, trail control: Tuned geometry reduces bind, improves tracking, and keeps the front end composed over chatter and big hits.
• Predictable steering: Caster adjustability helps reduce wander and improves return-to-center with larger tires.
• Clearance where it counts: Arm shape and placement maximize turning radius with wide tires and 5" backspacing wheels.
• 1.75" x .120" wall DOM steel tubes—fully welded for long-term durability.
• HD Uniballs at chassis pivots + FK rod ends on the adjustable link for tight, precise joint action.
• Corrosion-resistant finish on all major components.
• Made in the USA and proven across consumer, commercial, and military applications for over 30 years.