Cusco Adjustable Rear Upper Arms

2009–2015 Toyota Mark X (GRX120/GRX130), 2008–2013 Toyota Crown (GRS210/GRS214), 2005–2013 Lexus IS250/IS350 (Rear)

Part #: 199 474 L

Overview

The Cusco Adjustable Rear Upper Arms are high-performance suspension components designed to enhance the handling and stability of your vehicle. Whether you're a spirited street driver, a motorsports enthusiast, or someone seeking improved cornering precision, these upper arms provide a significant upgrade over factory components. Crafted for specific models including the Toyota Mark X, Crown, and Lexus IS250/IS350, they are engineered to deliver precise suspension tuning and improved responsiveness.

By replacing the stock rear upper arms with Cusco's adjustable version, you gain the ability to fine-tune your vehicle's rear alignment settings. This adjustment capability allows you to optimize camber and toe angles, which directly influence tire contact patch, grip, and overall handling characteristics. When combined with other performance modifications or high-grip tires, these arms help unlock your vehicle's full potential on the street or track.

Key Features

Designed with performance and durability in mind, the Cusco Adjustable Rear Upper Arms incorporate several advanced features:

• Constructed from high-strength steel with a corrosion-resistant coating, ensuring long-lasting durability even under demanding conditions.
• Adjustability through precision threaded joints, allowing for accurate camber and toe adjustments to suit your driving style and track requirements.
• Engineered with a lightweight design to minimize unsprung mass, contributing to improved handling response.
• Designed to reduce factory bushing slop, providing more direct and predictable suspension movement.
• Compatible with a wide range of suspension setups, making them ideal for motorsports, spirited driving, or aggressive street use.
• Manufactured by Cusco, a trusted name in high-performance suspension components with a reputation for quality and reliability.

Construction & Design

The Cusco Rear Upper Arms are meticulously crafted from high-quality steel, featuring TIG-welded joints for superior strength and precision. The adjustable threaded sections are engineered for smooth, backlash-free operation, allowing you to dial in your desired alignment settings with confidence. The arms are finished with a durable, corrosion-resistant coating to withstand harsh environments and road debris, ensuring longevity and consistent performance over time.

Performance & Handling

Installing Cusco's adjustable upper arms significantly improves your vehicle's handling characteristics. By enabling precise camber and toe adjustments, these arms help achieve optimal tire contact with the road, enhancing grip and cornering stability. The reduction in factory bushing slop results in more direct steering feedback and improved responsiveness, making your vehicle more predictable and confident in high-performance driving scenarios. Whether on the street or the track, these components help you fine-tune your suspension for maximum performance.

Installation & Fitment

The Cusco Adjustable Rear Upper Arms are designed as direct bolt-on replacements for the factory arms. Installation typically involves removing the existing upper arms and replacing them with the adjustable units using standard hand tools. No cutting, drilling, or complex modifications are required, and a professional alignment is recommended after installation to set the desired camber and toe angles. The process is straightforward for those familiar with suspension work, and Cusco provides detailed instructions to assist with installation.

• Direct bolt-on replacement for factory upper arms
• No cutting or drilling required
• Requires professional alignment for optimal setup

What's Included

• Pair of Cusco Adjustable Rear Upper Arms
• All necessary hardware and mounting components
• Installation instructions

Ideal For

• Performance enthusiasts seeking suspension tuning capabilities
• Owners of Toyota Mark X, Crown, or Lexus IS250/IS350 looking to improve handling
• Track day participants and motorsport competitors
• Drivers aiming to reduce factory suspension slop and enhance steering response

Emissions Note

These Cusco adjustable upper arms are designed for off-road or racing use only and may not be street legal in all jurisdictions. Please check local regulations before installation.