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The shims should never be used on the front axle. If used on the front steering axle it affects RTC and more. Castor is set by the spring perch. If you need to adjust drive shaft angle on the front (rarely needed because CJs do not run AWD and 4wd is usually low speed) it's a cut / reweld perch operation.
The shims are only to be used to adjust drive shaft angle on the rear axle because of the lift to help normalize drive line geometry and vibration @ highway speeds. The thick side points to the front to tilt the pinion up to the trans case to return the pinion angle to stock degrees.
The reason the sims are only for the rear axle is there is no built in castor on the rear axle because it does not turn.
The shims are only to be used to adjust drive shaft angle on the rear axle because of the lift to help normalize drive line geometry and vibration @ highway speeds. The thick side points to the front to tilt the pinion up to the trans case to return the pinion angle to stock degrees.
The reason the sims are only for the rear axle is there is no built in castor on the rear axle because it does not turn.