SPC Performance Specialty Shims Kit

Any solid axle 2WD or 4WD vehicle, 2011–2025

Part #: 89699

Overview

The SPC Performance Specialty Shims Kit 89699 is an essential upgrade for enthusiasts seeking precise alignment adjustments on solid axle vehicles. Designed to modify caster angles, this kit helps improve handling, steering response, and overall vehicle stability. Whether you're customizing your ride for off-road adventures or optimizing street performance, these shims provide a reliable and straightforward solution to fine-tune your vehicle's alignment geometry.

Ideal for both daily drivers and performance enthusiasts, the SPC Shims Kit allows you to adjust caster from 1/2° up to 4°, giving you the flexibility to enhance steering feel and cornering capabilities. Easy to install and compatible with a wide range of solid axle 2WD and 4WD vehicles, this kit ensures you can achieve the desired alignment specifications without extensive modifications.

Key Features

The SPC Performance Specialty Shims Kit 89699 offers a range of features designed to deliver precise alignment adjustments and durability:

• Manufactured from high-quality zinc-coated steel for corrosion resistance and long-lasting performance.
• Includes six shims with varying degrees of taper to accommodate different caster adjustment needs, from 1/2° to 4°.
• Twice the coverage with a compact inventory, reducing the need for multiple part numbers and simplifying your alignment process.
• Designed specifically for solid axle vehicles, ensuring a perfect fit and reliable operation.
• Easy to install with common hand tools, making it accessible for both professional mechanics and DIY enthusiasts.
• Helps support improved steering response, stability, and handling characteristics.
• Allows for precise caster adjustments to optimize vehicle performance based on driving conditions and personal preferences.
• Compatible with a wide range of makes and models, providing versatility for various applications.

Construction & Design

The SPC Performance Specialty Shims Kit 89699 is crafted from durable zinc-coated steel, ensuring resistance to corrosion and environmental wear. The shims feature a tapered design that allows for accurate caster adjustments when installed between the axle and the control arm or steering components. The kit's compact and comprehensive set of shims simplifies the process of achieving the desired alignment angles, reducing the need for multiple part numbers and inventory clutter.

Designed with precision in mind, these shims are engineered to provide consistent, reliable performance over time. Their robust construction ensures they can withstand the stresses of off-road driving, spirited street use, and everyday driving conditions. The easy-to-handle design facilitates straightforward installation, making alignment adjustments accessible even for those with limited mechanical experience.

Performance & Sound

While the primary focus of the SPC Shims Kit is on alignment precision and handling improvement, users can expect enhanced steering response and vehicle stability once installed. Proper caster adjustment contributes to more predictable steering behavior and can reduce tire wear caused by improper alignment angles. Although this kit does not directly influence engine performance or exhaust sound, its contribution to optimal vehicle handling makes it a valuable upgrade for performance-minded drivers.

Installation & Fitment

The SPC Performance Specialty Shims Kit 89699 is designed for a straightforward bolt-on installation. No cutting, drilling, or extensive modifications are required. The shims are installed between the axle and the control arm or steering components, depending on your vehicle's specific configuration. Basic mechanical skills and standard hand tools are sufficient to complete the installation, which typically takes less than an hour.

• Ensure proper vehicle lift and safety precautions before beginning work.
• Remove existing components as necessary to access the mounting points.
• Insert the appropriate shim(s) to achieve the desired caster angle.
• Reassemble and verify alignment specifications with proper equipment.

For best results, it is recommended to have a professional wheel alignment performed after installing the shims to confirm the correct angles and ensure optimal handling.

What's Included

• Six zinc-coated steel shims with varying degrees of taper (1/2°, 1°, 1-1/2°, 2°, etc.)
• Installation instructions and hardware as needed

Ideal For

• Off-road enthusiasts seeking precise caster adjustments for improved stability
• Street drivers aiming for enhanced steering response and handling
• Performance tuners customizing vehicle alignment for specific driving conditions
• Mechanics and DIYers looking for a reliable, easy-to-install shim kit

Emissions Note

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