SPC Performance Steel Shim 4X6.5X3 - Pack of 6

SPC Performance is known for making parts that help you dial in your suspension, and this steel shim kit is a prime example. If you're working on a heavy-duty truck, like a cement or garbage truck, or even an Over-The-Road (OTR) vehicle, and need to adjust your caster or pinion angles, these shims are what you'll want. They're designed to work with 4-inch wide leaf springs and give you a 3-degree change, which is crucial for getting your steering and drive axles aligned just right.

These shims are made from a high-strength steel alloy, meaning they're built to handle serious compression and the tough demands of commercial vehicles. You get a box of six shims, so you'll have enough to tackle the job. When you're ordering, make sure you know the length and width of your leaf springs so you can be sure these will fit perfectly. If you're using 'Z blocks' on your axle, SPC also offers axle spacers (PN 10798) that can help spread the load and fine-tune your ride height.