If your constantly loosing the C-bearing or ujoints, and your positive the pinion angle is ok (height of the rear end also) It's a good idea to have the drive shaft assembly balanced. With the shaft turning at 2-3k rpm's .5 oz can make the difference if the problem is around the center of the shaft. It will fatigue the metal over time and snap of the base.
Make sure your ujoints are in good shape also. Vibration from a bad ujoint will cause the bearing to fail prematurely.
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