Whether you use your Jeep to traverse rocky, off-road trails or smooth highways, you trust it to get you where you need to go. A properly functioning vehicle has to have the right setup from the suspension system to the engine. 4 Wheel Parts offers a wide selection of car parts to help you ensure your truck performs well.

Fix the Pinion Angle
The pinion angle of your Jeep plays a big role in its performance. For example, if you have a positive angle, which means the yoke of your rear end is tilted nose up, you could have trouble getting traction. The added stress of this setup could lead to your u-joints binding and your driveline components breaking. Installing a leaf spring axle shim changes the angle between your drive shaft and pinion yoke. Ideally, you should have a five- or seven-degree negative angle to ensure all components of your vehicle perform at their best.

Check the Pinion Angle
Are you trying to figure out if you need a Rubicon Express Degree Shim? Or perhaps you need to determine the size of shim you need? Either way, checking your current pinion angle helps you figure out exactly what type of product you need. Start with your truck or Jeep sitting with its weight on the wheels. Next, measure the angle of the drive shaft. After that, partially remove the drive shaft from the yoke, so you can measure the angle of the yoke. If your end is nose down, add the two numbers together to get your pinion angle. If your end is nose up, subtract your yoke angle from your drive shaft angle. Now you know what your angle is, you'll know how much of a shim you need to reach the ideal angle.

Find the Right Shim
Here at 4 Wheel Parts, we know your needs might not be the same as another car enthusiast. That's why we have a wide selection of shims, including a Pro Comp Degree Shim and Rancho Leaf Spring Shim Kit. Look through what we have to offer, and start adding parts to your cart today.

Some drivers are relatively content with the way their vehicle rolls off of the assembly line. For most jeepers, the real way of showing love for a 4x4 is customizing it until it feels just right. This usually starts with basic upgrades, such as tires and wheels, but it's amazing how fast it gets down to the mechanical engineering fundamentals. Leaf spring shims are a good example of how precise the tuning becomes when you start working on your suspension system. 4WheelParts.com is proud to offer a wide range of shims for nearly every setup.

Choosing an Angle
The most important part of choosing a shim is determining which angle you need. While some claim it's acceptable to approximate, shims are designed with a certain degree measurement for a reason. We carry all of the common sizes at 4WheelParts.com, so all you have to do is figure out exactly how much spacing your leaf springs need. Most of our leaf spring shims come in sets of two, but it never hurts to confirm that before you place your order.

When To Shim
The leaf springs in your suspension are designed to work at a certain angle, but the changes you make to your vehicle require you to do some fine-tuning. That's where a set of leaf spring degree shims comes in. Use these parts to get the correct articulation of your springs. That increases durability and often makes a difference in steering feel.

A Fair Deal
Rear shims, if they're high quality, are often not cheap. Your leaf springs absorb huge amounts of force, even if you're not out on the trail. That force is shared with your shims, so quality materials are a must. At 4WheelParts.com, we offer a competitive price-matching policy. Let us know before you purchase if you find someone selling the same product cheaper. Otherwise, just order today and get your shims as soon as possible. Make sure to order center pins as well if they're not included in the shim kit.