2017-2022 Ford Super Duty Adjustable 4-Link Conversion Kit | Stock to 10” Lift
2017–2022 Ford Super Duty Adjustable 4-Link Conversion Kit | Stock to 10" Lift
Your factory radius arms were designed for a stock truck. Once you lift it, they become a liability — causing axle wander, tire rub, and sloppy steering geometry. The Apoc Industries 4-Link Conversion Kit fixes all of it. Built from heavy-wall DOM tubing with fully adjustable upper and lower control arms, this kit lets you dial in your caster angle and recenter your axle with precision — whether you're running 2" of lift or pushing 10".
Fits 2017–2022 Ford F-250, F-350, and F-450 Super Duty. Engineered and assembled in the USA.
Why the Apoc 4-Link Kit?
- Full Adjustability: Recenter your axle and fine-tune caster angle independently — no compromises.
- Cam Eccentrics: On-vehicle caster adjustments without dropping the axle.
- PTFE Polyurethane Bushings: Self-lubricating, long-lasting, and greaseable for extended service life.
- No Drilling. No Welding. Bolt-on installation with mostly factory hardware.
- Improved Steering Geometry: Proper alignment and handling even with oversized tires.
- USA-Made: Heavy-wall DOM tubing, 1/4" steel plate brackets, Grade 8 hardware throughout.
What's Included
- 2 Upper Control Arms
- 2 Lower Control Arms
- 4-Link Conversion Bracket
- PTFE Polyurethane Bushings with Grease Fittings
- DOM Tubing Bushing Ends
- Mostly Factory Hardware (no custom bolts to chase down)
Installation
- Est. Install Time: 3–4 hours
- Tools Required: Basic hand tools, floor jack, jack stands
- No Drilling or Welding Required
- Alignment recommended after installation
Setting Arm Length
Control arm length must be set to match your lift height. Longer lift = longer arms. Detailed instructions are included. When in doubt, consult your lift kit manufacturer for precise measurements before installation.
Specs
- Tubing: 3/16" wall thickness / 2" OD DOM
- Bracket Material: 1/4" steel plate, fully welded / Grade 8 bolts
- Thread: Upper 1.25"-12 / Lower 1.25"-12
- Grease Fittings: 1/4"-28 thread
- Lift Range: Stock to 10"
- Rebuildable: Yes — basic hand tools only
- Country of Origin: USA
Complete Your Build
Running radius arms with your lift? Apoc has you covered:
- 2005–2022 Ford Super Duty Adjustable Radius Arms | Stock to 6" Lift — bolt-on adjustable radius arms for F-250, F-350, and F-450
- 2005–2016 Ford Super Duty Adjustable Radius Arms | 8"–13" Lift — for aggressive lift builds that need maximum arm length
- 2017–2022 Ford Super Duty 6" Lift Kit | Tubular Radius Arm — complete lift kit bundle with radius arm included
Need help planning your build? Visit our blog for install guides, build tips, and suspension breakdowns from the Apoc team.
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.
Component Specs
Compatible with Stock to 10" of lift
Yes
Yes, Size 1/4-28 Thread
Yes, no special tools required—just basic hand tools.
Ford Superduty 4 Link Conversion Kits
Superduty Suspension, Redefined
What all comes with a Superduty 4 Link Conversion kits?
Complete Kit – Ready to Install:
Engineered 4-Link Conversion for Your Super Duty
Apoc’s 4-Link Conversion Kit upgrades your Ford Super Duty’s suspension with enhanced control, smoother ride quality, and precise caster correction for lifted setups. The heavy-duty frame brackets bolt directly into the factory radius arm mounts—no cutting, welding, or drilling required. Each kit includes four extended-length control arms—two uppers and two lowers—fully assembled and ready to install. The kit also features upgraded axle-side cam eccentric bolts, giving you the ability to fine-tune caster easily—a feature never offered from the factory. Built for strength, simplicity, and serious performance.
Premium Bushings – Built for Life:
Apoc Industries backs our bushings with a Lifetime Warranty for lasting confidence. We use only the highest quality polyurethane (PTMEG-based) in all Apoc products.
PTMEG polyurethane offers superior articulation and a firmer, more responsive feel — without the harshness commonly found in solid joints like heims or flex joints.
These bushings are ideal for daily driving while providing excellent durability and performance for moderate off-road use.
Adjustable Length for Precise Handling:
Apoc control arm kits are designed with flexibility in mind. They are stock length when fully collapsed and up to 2.5 inches longer when fully extended, giving you plenty of adjustability to fine-tune your truck’s suspension geometry and handling. Whether you’re leveling, lifting, or optimizing alignment, our arms provide the range needed for a perfect setup.
100%
Red, White & Built Right
Lifetime Warranty Polyurethane Bushings
Built to Last, Easy to Rebuild
Apoc Industries' high-performance polyurethane bushings are backed by a lifetime warranty and engineered for durability you can count on. Easily rebuildable with basic tools, they deliver a firm, responsive ride without the hassle—made for daily drivers and built for the long haul.
Before
After
FAQ'S
Ford Superduty 4 Link Coversion FAQ's
A: A 4-link conversion replaces the factory radius arm setup, delivering better suspension geometry, improved ride quality, and more precise caster control—especially on lifted trucks. Unlike radius arms that limit articulation and can cause binding, a true 4-link setup allows each control arm to move independently, reducing stress on bushings and increasing flex. The result is smoother handling, better tire contact, and a more stable, confident ride—on the road or under load.hts.
At Apoc Industries, we understand that every suspension change impacts your vehicle’s geometry. That’s why we provide detailed installation instructions, including caster correction measurements tailored to a variety of lift and leveling heights. Whether you’re adding a small leveling kit or a full suspension lift, our guides ensure you have the correct specifications to dial in your alignment for maximum drivability, tire life, and performance.
Taking the guesswork out of your setup means better results — and a better ride..
A: Yes. Unlike the factory setup, the Apoc 4-Link Conversion Kit includes upgraded axle-side cam eccentric bolts, giving you full control over caster adjustment—a feature Ford never offered. Once your control arms are set to the correct length, these cams allow precise fine-tuning of caster, whether you're doing it yourself or having it aligned professionally. It’s a smarter, more flexible setup designed to improve drivability and alignment accuracy.
For PTMEG (polytetramethylene ether glycol) polyurethane bushings, the best grease is a silicone-based lubricant with PTFE (polytetrafluoroethylene) additives. Here’s why and what to consider:
Why Silicone-Based with PTFE?
: PTMEG polyurethane is resistant to petroleum-based products, but silicone-based grease is preferred as it won’t degrade the material and is explicitly recommended for polyurethane bushings.Tackiness
: PTFE additives lower the coefficient of friction and are waterproof, ensuring long-lasting lubrication and quiet operation.
: Silicone-based grease repels water, protecting bushings from corrosion and maintaining performance in wet conditions.
A: No cutting, welding, or drilling is required. The frame brackets are engineered to bolt directly into the factory radius arm mounts using existing holes, making installation clean, fast, and hassle-free. It’s a true bolt-on upgrade designed for maximum strength with zero guesswork.
Technical Resources
Caster Setup Guide
Everything you need to know about caster angle on lifted straight axle trucks — what it is, how to measure it, and how to set it correctly.
What is Caster? A Complete Guide for Lifted Straight Axle Trucks
A deep-dive technical guide explaining caster angle for lifted straight axle trucks — what it is, why it matters, how to measure it, and how to set it correctly with adjustable radius arms or 4-lin...