Fox Billet Upper Control Arm — 2024+ Tacoma / 4Runner / Land Cruiser / GX 550
The Fox Billet Upper Control Arm is a direct bolt-on replacement UCA for the 2024+ Toyota Tacoma, 2025+ Toyota 4Runner, 2024+ Toyota Land Cruiser LC250, and 2024+ Lexus GX 550 — all sharing the same front suspension architecture. When you lift these platforms, the factory upper control arm pulls the front wheels into a negative caster condition that causes handling degradation and uneven tire wear. The Fox Billet UCA corrects that geometry while also providing increased clearance for larger tires that the factory arm restricts.
CNC-machined from billet aluminum, the arm is significantly stronger and lighter than the factory stamped steel unit. The billet construction allows Fox to optimize the arm geometry precisely — not just replicate the factory dimensions with a stronger material. Available in Black or Orange.
Color Options
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Black — part number 803-35-006 (SKU: FOX803-35-006)
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Orange — part number 803-35-007 (SKU: FOX803-35-007)
Why You Need a UCA When Lifting
The factory upper control arm is designed for the OEM ride height and geometry. When you add a lift — even 1-2 inches — the arm's geometry changes in ways the factory didn't account for. The result is reduced caster (which affects steering return-to-center and high-speed stability), potential for ball joint bind at extreme suspension positions, and reduced clearance between the tire and the arm. A proper aftermarket UCA like this one corrects caster, restores full suspension travel, and provides clearance for larger tires.
Fitment
Fits: 2024-2025 Toyota Tacoma (all trims) • 2025+ Toyota 4Runner (all trims) • 2024-2025 Toyota Land Cruiser LC250 (all trims) • 2024-2025 Lexus GX 550 (all trims). Direct bolt-on replacement.
FAQ
Do I need a UCA even with a small lift?
Yes — even a 1-2" lift changes the front suspension geometry enough to benefit from a corrective UCA. Caster correction improves steering feel and stability; the increased clearance matters once you go to a larger tire.
Black vs Orange — is there a functional difference?
No — both colors are the same arm with the same geometry and construction. It's a purely aesthetic choice.
Is this a direct bolt-on or does it require other modifications?
Direct bolt-on replacement at the factory mounting points. A front wheel alignment is required after installation — plan for that as part of the install cost.
Does this work with the Lexus GX 550?
Yes — the GX 550 shares the same front suspension architecture as the Land Cruiser LC250 and Tacoma platform, so the same UCA fits all three.
What warranty does Fox provide?
Fox lifetime warranty on the arm against manufacturing defects.
