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The principal of the weep hole is to allow for air to move in and out of the tube of the splined part of the yoke. This allows for an easier movement, when the driveline moves with the action of the rear suspension. This way a vacuum is not created on a withdrawal of the shaft and also pressure is not created on an insertion of the shaft. The relatively safe answer to all problems is to plug the hole, or replace the seals and bushing- like it should be. Your Choice.
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