4130 Tubular Ball Joint Upper Control Arms, Silent Spin Bushings

If you drive a 2021–2025 Ford F-150 (2WD or 4WD) and you’re ready to upgrade your suspension, Dirt King upper control arms are the perfect solution. These 4130 chromoly F150 upper control arms are built to fix the common problems that show up once you add a lift—like squeaky bushings, high-maintenance joints, and poor alignment geometry. Whether you’re daily driving, overlanding, rock crawling, or blasting through desert terrain, these UCAs are designed to perform.

Dirt King upper control arms feature maintenance-free SilentSpin™ bushings that eliminate the need for grease fittings while keeping your ride quiet and smooth. They also include heavy-duty ProBearing Pro 4 ball joints for exceptional articulation, strength, and durability, sealed to keep out dirt and debris. Designed to maintain proper alignment from 0–3" of lift and add about an inch of down travel, these arms are the perfect match for aftermarket coilovers from King, Fox, Ride Shocks, and more.

• Pro 4 Series Ball Joints – Forged SAE4140 housing, 38° 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