KSP Front Upper Control Arm for Toyota 4Runner 2003-2023 - Forged

Our review of the KSP Front Upper Control Arm finds it best suited for owners of lifted Toyota and Lexus rigs who need a durable, serviceable replacement that corrects geometry after a 2-4' lift. The single biggest reason to buy is its one-piece forged T6 aluminum construction which is lighter than OEM iron parts and resists rust, backed by precision CNC machining and magnetic particle inspection during production. That combination delivers a robust control arm intended to outlast stock components in snowy or corrosive environments.

Key Features

• One-piece forged design: Provides a lighter but stronger replacement that eliminates welded seams and weak points for long-term strength.
• T6 aluminum, rust resistant: Upgraded alloy construction prevents corrosion even after exposure to melting snow and road salt.
• Serviceable greasable socket: Allows new lubricant to flush contaminants, reducing wear and prolonging the ball joint life when maintained.
• Polyurethane bushings: Premium bushings handle extreme temperatures better than rubber and improve driving feedback and noise control.
• Correct ball joint angle for lifts: Designed to provide greater range of motion for 2-4' lift applications, helping restore proper chassis geometry.
• Quality inspection: Each arm is inspected with magnetic particle testing to detect defects and ensure structural integrity.

Who It's For

The KSP Front Upper Control Arm is for 4Runner, FJ Cruiser, Land Cruiser Prado and GX owners running a 2-4' lift who want a durable, non-rusting aluminum arm that improves articulation and resists corrosion. It appeals to buyers who prefer a serviceable ball joint and upgraded bushings for better on-road feedback and off-road compliance.

Those who should look elsewhere include drivers who want OEM-spec iron arms with factory ball joint materials or anyone unwilling to perform periodic greasing and inspection, since the serviceable features require maintenance to realize their full life expectancy.

Pros & Cons

Pros

• Forged T6 aluminum construction is lightweight and resists rust compared with uncoated iron arms.
• Serviceable greasable socket and protective dust covers extend component life when maintained.
• Polyurethane bushings offer improved feedback and reduced noise over rubber bushings.
• Built to correct ball joint angle for lifted suspension setups, improving alignment range.

Cons

• Some customers reported ball joint boot durability issues, so inspect boots during install and maintain greasing.
• Requires periodic maintenance to get the most life from the greasable socket and bushings.

Specifications

Our Verdict

The KSP Front Upper Control Arm is a solid value for owners of lifted Toyota and Lexus SUVs who want a corrosion-resistant, higher-performance replacement arm. Its forged T6 construction, greasable socket and polyurethane bushings make it durable and better suited to lifted geometry than many stock arms, provided the user performs routine maintenance and watches the ball joint boots for wear.

Frequently Asked Questions

Will this fit my lifted 4Runner?
Yes, it is designed to accommodate 2-4' lift setups for 4Runner model years listed in the compatibility spec.

Does the arm require special maintenance?
Routine greasing of the serviceable socket and inspection of dust boots is recommended to maximize life.

Is this control arm rust proof?
The T6 aluminum construction resists rust and the ball joint pin uses a zinc-nickel coating to improve corrosion resistance.