Axle Shims (pair)

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Axle Shims

Steel shims to go between your leaf springs and your spring perch. These are used on leaf spring vehicles in order to adjust pinion angles and achieve proper drive line geometry. Our shims are 2.5" wide and 4" long, machined from steel, and include a new set of 3/8" diameter center bolts. Select size (in degrees). Measure the width of your springs to make sure they are 2.5" wide as this is not the stock width for some applications. 

Click here for information and photos showing how to measure drive shaft angles.

Use the calculator below to determine the right size shims. The shim calculator figures out the current joint angle, takes into account how much the drive shaft slope changes as a result of the shim, and aims to achieve a 2-3 degree net joint angle. The calculator is only for double cardan rear drive shafts. If you have something else or if you have questions, give us a call. 801-737-0757


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Worried that too much pinion angle will prevent your pinion bearing from getting oil? 

This is a common concern, and one that makes a lot of sense at its surface. However, once you take a closer look at how the oil circulates through the differential you can see that as long as you have the right amount of oil in there the oil will go where the oil needs to go. This is demonstrated in the video below. The video primarily focuses on the need for rounded shape in the diff cover but it also shows you how the oil cycles through the differential. 

Customer Reviews

Based on 65 reviews
David C
Fits perfectly

Corrected the very steep drive line angle on my CJ5.

Kenneth Polovich

Really nice pieces , I would buy again and recommend other do as well.

thomas werner
79 fj40

Perfect fit. Warp speed shipping. Easy install. Tracks straight now!!

91 blazer ,3 inch lift

Added 6 degree Shims in rear ,went from a 14 degree diff. To a 3 degree diff. From drive shaft to axle. Worked great

Shaun Abbott
Fj40 wandering

Shims improved drive quality.
The supplied bolt is larger than stock and requires removing leaf springs and drilling the hole larger. Also larger nut required drilling bottom spring plate hole larger.