SPC Performance Specialty Shims Kit

Application: Any Solid Axle 2WD or 4WD Vehicle, 2010–2025

Part #: 89399

Overview

The SPC Performance Specialty Shims Kit 89399 is a precision-engineered solution designed to help you fine-tune the caster angle of your solid axle vehicle. Whether you're restoring proper alignment, improving handling, or customizing your vehicle's stance, this kit provides a reliable and straightforward way to adjust caster from 1/2° up to 4°. Ideal for off-road enthusiasts, performance drivers, and mechanics, these shims allow for precise alignment modifications to enhance steering response and vehicle stability.

Constructed with durability and ease of installation in mind, the SPC Shims Kit offers a versatile approach to vehicle alignment adjustments without the need for extensive modifications or specialized tools. By changing the caster angle, you'll experience improved steering feel, better cornering, and increased control, especially on challenging terrains or during spirited driving.

Key Features

The SPC Performance Specialty Shims Kit 89399 boasts several key features that make it a must-have for serious vehicle enthusiasts and professional technicians:

• High-quality zinc-coated construction ensures corrosion resistance and long-lasting durability in harsh environments.
• Includes six shims, each measuring 3 inches in width, with taper and degree options ranging from 1/2° to 2°, allowing for precise caster adjustments.
• Designed specifically for solid axle 2WD and 4WD vehicles, providing a universal fit across a wide range of models.
• Twice the coverage with a compact inventory, reducing the need for multiple part numbers and simplifying your parts management.
• Easy to install with standard tools, making alignment adjustments accessible for both professional shops and DIY enthusiasts.
• Helps restore factory alignment specifications or customize caster for specific driving needs, improving handling and steering response.
• Manufactured by SPC Performance, a trusted name in suspension and alignment components, ensuring quality and reliability.

Construction & Design

The SPC Shims Kit 89399 features precision-cut, zinc-plated steel shims designed to withstand the rigors of off-road and street driving. The zinc coating provides excellent corrosion resistance, ensuring longevity even in wet or salty conditions. The shims are engineered with exact taper and thickness specifications to allow for accurate caster adjustments, helping you achieve optimal alignment settings without compromising safety or performance. The compact design facilitates straightforward installation, fitting seamlessly between the axle and control arm or mounting points, depending on your vehicle's configuration.

Performance & Benefits

By installing the SPC Performance Specialty Shims Kit, you can expect improved steering feel, enhanced vehicle stability, and better handling characteristics. Adjusting caster positively influences steering response, reduces wandering, and can help correct alignment issues caused by lifted suspensions, accidents, or wear. This kit provides a cost-effective way to optimize your vehicle's alignment, supporting better control during off-road excursions or spirited driving sessions.

Installation & Fitment

The SPC Shims Kit 89399 is designed for easy bolt-on installation, requiring no cutting or drilling. It fits directly between the axle and the mounting components, making it suitable for both professional alignment shops and experienced DIYers. Basic mechanical skills and standard hand tools are sufficient to complete the adjustment process. Always follow your vehicle manufacturer's specifications and alignment procedures when installing these shims to ensure proper fitment and safety.

• No cutting, drilling, or specialized modifications are required for installation.
• Ensure proper vehicle lift and safety precautions before beginning work.
• Consult your vehicle's service manual or a professional technician for precise alignment settings.

What's Included

• Six zinc-coated steel shims with taper and degree options (1/2°, 1°, 1-1/2°, 2°)
• Installation hardware and instructions (if provided)

Ideal For

• Off-road enthusiasts seeking improved steering control and alignment precision
• Performance drivers aiming for optimized handling and stability
• Mechanics and DIYers performing suspension or alignment repairs
• Vehicle owners restoring factory alignment or customizing caster angles

Emissions Note

This product is designed for off-road or racing use only and may not be legal for street use in all jurisdictions. Please verify local regulations before installation.