4130 Upper Control Arms

Description Dirt King 4130 Upper Control Arms – Built to Solve Real Problems If you drive a 2025+ 4Runner (2WD or 4WD) and ready for a suspension upgrade, these 4130 UCAs are for you. We made them to tackle the exact issues we kept running into ourselves—squeaky bushings, joints that need constant attention, and geometry thrown off as soon as you add a lift. Whether you’re daily driving, overlanding, rock crawling, or chasing desert trails, these UCAs handle it all. 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 our shocks or other 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 4Runner 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. Specifications Amount of Lift: Allows for 0-3” of lift Track Width: Stock Maximum Backspacing: 5.75” Minimum Rim Size: 17” Note: Do not install with coil spacers combined with extended-length aftermarket shocks. What's Included 4130 Chromoly upper control arms Probearing SilentSpin Hybrid bushings Heavy-duty Probearing Ball Joints Ball joint caps Dirt King sticker pack Features 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   Instructions   Compatibility 2025 Toyota 4Runner 2WD / 4WD *This product is designed to pair with OEM and Dirt King parts. Compatibility with other brands must be approved by the respective manufacturer.