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, machined from steel, and include a new set of 3/8" diameter center bolts. Select size (in degrees).
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
Do not be skeptical. It is worth the money and they are exceptionally manufactured/come with new/longer leaf pack bolts. Make your working angle measurements and use these steel shims or you will not repair your drive-line vibration. I used the calculator and got 5 degree shims, pinion angle ended on -2 degrees and my vibration is gone. Thank you Tom.
These shims are very solid. They measured exactly 3°. I ordered them because it’s hard to find 3° shims, and I needed exactly 3°. It’s a good shim, what is there to say?
I wrongly assumed that these might come with the most common sized center bolt for Jeep springs (5/16”). They came with 3/8” bolts. I didn’t bother calling for support because I was in a hurry, I just grabbed some locally. My fault for not asking before I ordered. It’s getting harder to find 5/16” center bolts, so I’m not even surprised that these came with a more popular size. You should probably add it to the product description.
Was nervous that the math wasn’t working out and I’d need a much larger shim. Gave them a call and they verified my measurements with me and the 2 degree shims provided much more angulation than expected and worked perfectly!
Worked awesome . Looked great