You lubed the slip yoke, right? The grease just takes up the clearances on the worn out areas....makes em temporarly tighter and quieter....mine would run for a week or two and then the grease would just heat up and move outta the way a bit...makeing the worn slpined areas loose again...and then noise and vibratioin came back...
a bad seal could also be an issue here, but its too late for that now if you hear noises and vibrations
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