Hello. I am in the process of replacing the rear wheel bearings on my 66 cj5a. i pulled the driver side shaft and found the bearings bad as i suspected. However when i pulled the passenger side shaft i noticed some thing odd. the bearings was perfect , what happened was there where so many shims between the bearing race and the retaining plate that the race backed out just enough to cause the play in the axle i mistook as a bad bearing. so my question what exactly are the shims used for ? and in what order should they go in to prevent this issue again?