Pinion angle shims

[moriartii]

I am in the process up updating my suspension on my CJ7 . Refreshing the Dana 30 up front, installing a drum to disk conversion, and doing the YJ suspension upgrade using OME springs.

I am following another members build on his 82 CJ. I am in the same boat regarding shocks and the pinion angle shims.

I think I am going to use Bilstein shocks as I will have about a 2.5" lift.

This is a round about way of getting to my question, may someone explain the pinion angle shims? I understand pinion angle and what the shims would be used for. In taking all this apart there were not shims so I am not sure what to go back with or how to figure the correct angle.
Lee

 

[Lumpy Grits]

Shims go between the spring pack, and 'pad' on the axle.
Get the softest valved shocks you can find. Bilstein is not that.
LG

 

[1979bettywhite]

Also, get a proper alignment done after the lift install. It will tell you where your caster angle is. You may not need shims. I did not after my 2.5" lift. I am on the low end of the range, but I am getting good return to center and drive ability.


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[tarry99]

This is a round about way of getting to my question, may someone explain the pinion angle shims? I understand pinion angle and what the shims would be used for. In taking all this apart there were not shims so I am not sure what to go back with or how to figure the correct angle.
Lee

You need to first get that rig on level ground and start measuring with an angle finder.........Lift, large tires, long shackles will all effect what happens at the front axle as adding or correcting castor angle will work the opposite on your pinion angle........which is more important?.........if you drive allot at speed probably your castor angle...........if you run around with your front axle engaged allot then perhaps pinion.........measure your castor first....5-7 degrees positive is about right on a Jeep........on pinion.........keep in mind that angle should be measured in conjunction with the angle coming out of your Transfer Case .......lots of good info on line so do your research......but in most cases a compromise on angles between the two may be necessary.