Ford Adjustable Radius Arms, 2005–2022 Super Duty F-250/F-350/F-450, 8–13 in. Lift
2005–2022 Ford Super Duty Adjustable Radius Arms | 8"–13" Lift – F-250 / F-350 / F-450 – USA-Made
Restore Proper Caster. Center Your Axle. Eliminate Tire Rub on Serious Lifts.
Running 8" to 13" of lift on your 2005–2022 Ford F-250, F-350, or F-450 Super Duty? At that height, factory radius arms simply can’t maintain correct steering geometry — and the result is dangerous wander, off-center axle placement, and tire rub. Apoc Industries Adjustable Radius Arms are precision-built in East Tennessee from heavy-duty DOM tubing, giving you the length and adjustability needed to bring caster back into spec, re-center your axle in the fender wells, and restore confident, stable handling — even on the most aggressive builds.
⚠️ 4WD Only — Will NOT Fit 2WD Models
Why Apoc Industries Adjustable Radius Arms Are the Right Choice for High-Lift Super Duty Builds
- Designed for 8"–13" of Lift: Built specifically for serious lifts where factory arms and standard drop brackets fall short.
- Uses Drop Radius Arm Brackets: Works in conjunction with drop brackets to achieve proper alignment angles at extreme lift heights.
- Heavy-Duty DOM Tubing: Far stronger than factory stamped arms — built to handle the abuse of big tires, towing, and off-road.
- Greaseable Flex Joints: Long-life performance with easy maintenance and reduced vibration transfer.
- Includes Cam Bolts: Simple alignment adjustments for optimal steering geometry right out of the box.
- Built Tough in the USA: Designed and manufactured in East Tennessee — engineered for the demands of the Super Duty platform.
- Easy 3–4 Hour Install: Bolt-on design with basic hand tools. Full instructions included.
Why You Need Adjustable Radius Arms at 8"+
Ford’s solid front axle has no factory caster adjustment. At stock height this isn’t an issue — but once you add significant lift, caster is dramatically reduced and the axle shifts forward out of center. At 8"–13" of lift, the symptoms become serious:
- Severe steering wander at highway speeds
- Loss of steering returnability — the wheel won’t self-center
- Heavy tire rub when turning — especially with larger tires
- Axle shift — the front axle moves forward and sits off-center in the fender wells
- Accelerated and uneven front tire wear
Adjustable radius arms are the correct fix — not a workaround. They allow you to re-establish proper caster angle and re-center the axle, something cam bolts alone cannot address at this lift height. Wider wheels with aggressive offset will feel the effects of poor caster even more, making this upgrade critical for any serious build.
Important: Always set arm length to match your specific lift size. If you’re unsure of your exact lift measurement, contact your lift kit manufacturer to verify before setting arm length. A professional front-end alignment is strongly recommended after installation.
What’s Included
- (2) Adjustable Radius Arms with Heavy-Duty DOM Main Tube (Driver & Passenger)
- Alignment Cam Bolts
- Greaseable Flex Joints
- All Required Hardware
- Detailed Installation Instructions
Fitment
2005–2022 Ford F-250, F-350, and F-450 Super Duty (4WD models only; confirm exact year/engine for best results). Designed for use with drop radius arm brackets at 8"–13" of lift.
Upgrade Tip
These arms are designed to work with drop radius arm brackets for proper geometry at extreme lift heights. Pairing with a complete lift kit? Browse our full Ford Super Duty suspension lineup for lift kits, leveling spacers, and drop brackets to complete your build.
📄 Download Install Instructions
Ready to tame your lifted Super Duty? Add these USA-made adjustable radius arms to your cart today and feel the difference premium American-made suspension makes.
Explore More for Your Build
- 6" Tubular Radius Arm Lift Kit for 2017–2022 Ford F-250 Super Duty – Complete lifted suspension solution.
- Radius Arm Drop Brackets for 2–4" Lift – Extra flexibility for your build.
- Full Ford F-250 Super Duty Collection – Browse more lift kits, leveling spacers & accessories.
Apoc Industries – Proud East Tennessee manufacturer of premium off-road suspension components. Built for enthusiasts, by enthusiasts. Direct-to-you pricing with fast shipping and expert support.
Shop confidently with our satisfaction guarantee and lifetime customer support on all suspension products.Built Right. Backed Right.
Our crew’s on call Monday–Friday, 9–5 EST. Hit us up at 865-983-5004 — real support, done right.
Ford Super Duty Radius Arm — Common Questions
FAQ
Have questions about our Ford Super Duty Adjustable Radius Arms? Find answers to the most common fitment, installation, and technical questions below.
Will this help my steering after adding a leveling kit?
Yes, absolutely. When you add a leveling kit to a 2005–2022 Ford Super Duty, the factory radius arms have no way to compensate for the loss of caster angle — which leads to wandering, pulling, and poor returnability. Our adjustable radius arms restore proper caster geometry, giving you confident, straight-tracking steering and dramatically improved highway feel.
Will this help with tire rub?
Yes, in most cases it will reduce or completely eliminate tire rub. On this vehicle setup, tire rub is usually caused by the tire contacting the rear lower fender well at the pinch weld. By allowing you to push the front axle forward approximately 1/2" to 3/4", you gain critical clearance in that area. Results will vary depending on tire size, wheel backspacing, and offset — but these radius arms are one of the most effective fixes for rub on leveled and lifted Super Dutys.
What is the cam bolt adjustment used for?
The cam bolt gives you precise, on-vehicle caster adjustment without swapping parts. After installing your lift or leveling kit, you simply rotate the cam bolt to dial in your ideal caster angle. Correct caster is essential for stable straight-line tracking, proper steering returnability, and reducing stress on your front end components — all of which suffer when a lifted truck runs factory-length, non-adjustable arms.
How much lift does this radius arm work with?
The stock height is 6" of lift. These radius arms are designed to restore the caster angle and axle position compromised when lifting the front end, making them an essential upgrade when the factory arms can no longer maintain proper geometry.
Why does the radius arm use a flex joint at the frame mount?
Our radius arms use a flex joint at the frame mount to maximize articulation — whether you're tackling technical off-road terrain, overlanding trails, or the daily punishment of unpaved job site roads. Unlike a rubber bushing, which limits range of motion and can bind under flex, a flex joint allows full, unrestricted articulation without sacrificing durability or geometry. The result is better axle movement, reduced bind, and a more capable suspension under real-world conditions.
Built to Take a Beating. Engineered to Keep You Straight.
Eccentric Cam Bolts
Cam bolt for easy on car adjustment of caster
DOM Tubing
DOM tubing construction delivers unmatched strength. Straight main tube engineered to withstand the most demanding terrain.
Adjustable Upper Arm
Adjustable upper arm positioning delivers correct caster geometry at any lift height. The integrated cam bolt allows precise fine-tuning — no guesswork, no compromises.
2005–2016 Ford Super Duty F-250 Adjustable Radius Arms
Why It Installs Easy
Our 2005–2016 Ford Super Duty F-250 adjustable radius arms are engineered for a straightforward, no-drill installation. Designed for lifted and leveled trucks, these USA-made radius arms deliver improved suspension geometry, reduced bind, and long-term durability — whether you're running a 2" level or a full lift kit.
No Drilling or Cutting
A true bolt-on installation — no fabrication required. These radius arms are designed to work with your factory mounting points, keeping the install clean and straight forward without modifying your frame or suspension.
Remove & Replace
Simply remove your factory radius arms and bolt on the new units. No special tools or professional fabrication needed — just basic hand tools and a jack. The arms are engineered to drop directly into the factory locations for a hassle-free swap.
Preset Measurements Included
No guesswork on arm length. Every kit includes a measurement sheet with the exact arm lengths for your specific lift or level height. Simply set your arms to the specified measurement during install and you're ready to go. Fine-tune alignment with the included cam bolt for dialed-in geometry.
Why 2005-2022 Ford Super Duty Trucks Need Adjustable Radius Arms After a Lift
A practical look at how lifting a 2005–2022 Ford Super Duty changes front-end geometry, and how adjustable radius arms and flex joints help restore control on the road and articulation off-road.