SPC Performance Specialty Shims Kit

Application: Any solid axle 2WD or 4WD vehicle, 2010–2025

Part #: 89599

Overview

The SPC Performance Specialty Shims Kit 89599 is an essential upgrade for vehicle enthusiasts and mechanics seeking precise caster adjustments on solid axle vehicles. Designed to provide a simple yet effective way to modify caster angles, this kit helps improve steering response, stability, and tire wear. Whether you're restoring a classic or fine-tuning a modern off-road or street vehicle, these shims allow you to achieve optimal alignment settings for enhanced driving performance.

Ideal for both daily drivers and performance-oriented builds, the SPC Shims Kit offers versatility and ease of installation. By adjusting caster from 1/2° to as much as 4°, you can tailor your vehicle's handling characteristics to suit your driving style and conditions. This kit is perfect for off-road enthusiasts, racers, or anyone looking to improve vehicle alignment without extensive suspension modifications.

Key Features

The SPC Performance Specialty Shims Kit 89599 features high-quality materials and precise engineering to ensure durability and reliable performance. The shims are made from zinc-coated steel, providing excellent corrosion resistance and longevity in demanding environments. The kit includes six shims, each measuring 3 inches in width, with varying degrees of taper to accommodate different caster adjustment needs.

• Twice the coverage with six shims, reducing the need for multiple part inventories
• Adjusts caster positively or negatively from 1/2° to 4°, offering flexible alignment options
• Constructed from durable zinc HD steel for corrosion resistance and long-lasting performance
• Designed for easy installation with existing suspension components, requiring no specialized tools
• Suitable for any solid axle 2WD or 4WD vehicles, making it a versatile solution for a wide range of applications
• Precision-tapered design ensures accurate and consistent caster adjustments
• Helps improve steering feel, stability, and tire wear by fine-tuning alignment angles
• Part of SPC Performance's trusted lineup of suspension and alignment components, known for quality and reliability

Construction & Design

The SPC Shims Kit 89599 is crafted from high-grade zinc-coated steel, ensuring resistance to rust and corrosion even in harsh driving conditions. The shims feature a precise taper design that allows for accurate caster adjustments without compromising the integrity of the suspension components. Each shim is engineered to fit seamlessly between the axle and the control arm or steering components, providing a secure and stable modification.

The kit's design emphasizes ease of installation, with all shims matching the specified dimensions for straightforward compatibility with most solid axle setups. The zinc coating not only enhances durability but also maintains a clean appearance over time, making these shims suitable for both street and off-road vehicles.

Performance & Benefits

By installing the SPC Performance Specialty Shims Kit 89599, you can expect improved steering response, better vehicle stability, and more even tire wear. Adjusting caster positively can enhance straight-line tracking and cornering, while negative adjustments can improve maneuverability in tight turns or off-road conditions. The ability to fine-tune caster angles helps you optimize your vehicle's handling characteristics for your specific driving needs.

Installation & Fitment

The SPC Shims Kit is designed for a straightforward bolt-on installation, requiring no cutting or drilling. It fits directly between the axle and suspension components, making it suitable for DIY enthusiasts and professional mechanics alike. Basic tools such as a jack, jack stands, and standard hand tools are sufficient for installation. No special tuning or alignment adjustments are necessary beyond the caster correction provided by the shims, but a professional wheel alignment is recommended after installation to ensure optimal handling and tire wear.

• Easy bolt-on installation with existing suspension hardware
• No cutting, drilling, or complex modifications required
• Compatible with a wide range of solid axle 2WD and 4WD vehicles from 2010 to 2025

What's Included

• Six zinc-coated steel shims (6 pieces total)
• Installation instructions

Ideal For

This kit is perfect for vehicle owners looking to improve steering precision, stability, and tire longevity. It's especially beneficial for off-road enthusiasts, racers, or anyone performing suspension upgrades or restorations that require caster adjustments. Whether you're fine-tuning your daily driver or preparing a vehicle for competitive use, the SPC Performance Specialty Shims Kit 89599 provides a reliable and cost-effective solution.

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 check local regulations before installation if emissions compliance is a concern.