Dirt King 4130 Upper Control Arms | 2021-2025 F-150

Dirt King 4130 Upper Control Arms support 0-3" of lift, correct suspension geometry, and increase down travel, featuring maintenance-free SilentSpin bushings and heavy-duty Pro 4 ball joints for quiet, dependable performance.

Dirt King 4130 Upper Control Arms – Built to Solve Real Problems
These arms feature maintenance-free SilentSpin™ bushings that eliminate grease fittings and unwanted noise, along with heavy-duty Probearing Pro 4 ball joints for high articulation and superior strength. The ball joints are sealed to block out debris and finished with anodized caps. Built to maintain proper alignment from 0–3" of lift, these arms also add roughly an inch of down travel compared to stock, a must-have when paired with aftermarket coilovers like King, Fox, Icon, and more.
Why Go Dirt King?

• SilentSpin™ bushings — no squeaks or maintenance
• Pro 4 ball joints with sealed dust caps
• Rebuildable, USA-made construction
• Precision-welded 4130 chromoly tubing
• Shipped preassembled for faster installs

Upgrade Your F150 With Confidence
Built and tested in the USA, these 4130 UCAs are engineered for the long haul—perfect for rigs that work hard on weekdays and explore even harder on weekends. It’s the last set of upper control arms you’ll ever need.

Features

• Pro 4 Series Ball Joints – Forged SAE4140 housing, 76° of articulation, and induction-hardened ball stud for maximum strength and smoother steering feel
• SilentSpin Hybrid Bushings – Maintenance-free, greaseless, and engineered for quiet, free-spinning articulation
• Geometry Corrected – Improved caster and pivot angles deliver better handling and control with up to 3” of lift
• 4130 Chromoly Construction – Built with high-strength tubing and reinforced gussets for extreme durability
• Fully Rebuildable Design – All wear items are replaceable for long-term reliability
• Corrosion-Resistant Finishes – Zinc-plated hardware and black powder coat protect against the elements
• Professionally MIG Welded – Ensures structural integrity for demanding off-road use
• Preassembled – Quick, hassle-free installation with no guesswork
• Made in the USA – Built with pride and quality you can trust

What's Included

• Chromoly upper control arms
• Probearing SilentSpin Hybrid bushings
• Heavy-duty Probearing Ball Joints
• Ball joint caps
• Dirt King sticker pack

Specifications

• Amount of Lift: Allows for 0–3” of lift
• Track Width: Stock
• Maximum Backspacing: 4.75”
• Minimum Rim Size: 17”

Note: Do not install with coil spacers combined with extended-length aftermarket shocks.

Compatibility

Excludes STX model with “Short” spindle
Not compatible with models equipped with Dynamic Bending Headlights.
Not compatible with models equipped with Continuously Controlled Damping (CCD) system.

Fitment Notes

This product is designed to pair with OEM and Dirt King parts. Compatibility with other brands must be approved by the respective manufacturer.