Axle Shims (pair)

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  • Regular price $50.00
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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 49 reviews
Harold Haraldsen
Excellent shims, worked great. Easy to install.

Installed shims on my front and rear axle of my 1979 Jeep CJ5. Has about a 3" OME lift using YJ springs. Used a 6 degree in the front and 10 degree in the rear. Installed easily, was able to reuse the original center pins which was good because the included ones were way to big and would required drilling everything out. Got my caster and my rear pinion exactly where I wanted them.

John H
2deg sims - 66 Mustang

Worked great. Easy to install.

used jeep 4" lift

had a used jeep w a 4" lift
had shims and the double u joint drive axle when i bought it
had a troubling vibration
measured the driveline angle and pinion ...way off
took everything apart hoping to figure the used aluminum shim degree
called Tom 'Wood to tell them it was between 4 and 6 degrees
calculator suggexted 8 degree shim
they suggested the 12 degree shim
worked perfect ....driveline to pinion ended up at 2 degree difference

Chris Mader
Canadian brokerage fees

Canadian buyers beware. I paid 40 dollars brokerage fees on a 70 dollar item. Not Tom Woods issue, just something to note.

Fit perfect

Ted B.
3 degree steel axle shims.

After replacing the multi leaf springs on my 1968 Camaro, the pinion angle needed adjusting. After measuring the transmission output shaft angle, the driveshaft angle and the pinion angle on the rear differential, it was determined I needed the 3 degree pinion shims to bring it back into alignment. The shims are of good quality being made of steel and were easily installed. They were reasonably priced and arrived in about 7 days. I'm glad I made the purchase from Tom Wood's.