Improving Spindle Alignment and Kingpin Performance: A Step-by-Step Guide

When it comes to maintaining your vehicle's suspension system, proper spindle alignment is crucial for optimal performance. In this article, we'll explore the importance of accurate spindle alignment and provide a step-by-step guide on how to achieve it using STEMCO Kaiser kingpin bushings.

The Importance of Spindle Alignment

Spindle alignment plays a vital role in ensuring smooth vehicle operation and preventing premature wear on critical components such as kingpins, seals, and bearings. When the spindle is out of alignment, it can lead to uneven tire wear, reduced handling, and decreased overall performance.

Step-by-Step Guide to Improving Spindle Alignment

1. Determine if Your Vehicle Needs King Pins: Before proceeding with the spindle alignment process, check for any signs of kingpin wear or damage. Use a magnetic mounted dial indicator attached to the top of the axle to measure horizontal movement. If there is more than 0.010' movement, it's likely that your vehicle needs new king pins.

2. Disassemble the Wheel End and King Pins: Remove the spindle and repeat the process on the opposite side of the truck. This will ensure that both sides are properly aligned.

3. Remove King Pin Bushings and Seals: Use an 'ST' series STEMCO Kaiser bushing driver (Part # ST70-7 for 12k axles) to remove the kingpin bushings and seals from the spindle eyes. Avoid using a punch or chisel, as this can damage the spindle eyes beyond repair.

4. Hone Axle and Spindle Eyes: Use a brake hone in a hand drill to lightly hone the axle eye until smooth. Do not overhone, as this can lead to excessive wear on the bearings.

5. Gauge Axle and Spindle Eyes: Check the axle eye for any signs of out-of-roundness using a micrometer and T-gauge. Similarly, gauge the spindle eyes to determine if they are out of round. If either is found to be out of specification, it's essential to address this issue before proceeding.

6. Install New King Pin Bushings: Hold the spiral steel bushing in hand, tilted slightly, and twist the bushing into the spindle eye turning the bushing clockwise. Use a brass hammer or dead blow hammer to pound the seal into the spindle eye until the driver is flush with the bottom of the spindle eye.

7. Install Seal on End of Driver: Install the seal on the end of the driver with the beveled edge facing outwards. Use an 'ST' series STEMCO Kaiser bushing driver (Part # ST70-7 for 12k axles) to secure the seal in place.

8. Test Spindle Alignment: Slide a pin through both bores to test spindle alignment. Tap any remaining amount of the bushing into the spindle using a brass hammer until it is flush with the spindle eye.

9. Final Inspection: Once the new kingpin bushings and seals are installed, inspect the axle eyes and spindles for any signs of damage or wear. If everything looks good, your vehicle should be ready to hit the road with improved performance and reduced maintenance needs.

In conclusion, maintaining proper spindle alignment is crucial for optimal vehicle performance and longevity. By following these steps using STEMCO Kaiser kingpin bushings, you can ensure that your suspension system runs smoothly and efficiently. Remember to always consult a professional mechanic if you're unsure about any aspect of the process.

Stemco kingpin