If you aren't experiencing a vibration at road speed, just let it go. You can check the joint while the shaft is out if you want to. Rotate the joint from side to side slowly feeling for catches in both axis. If you feel a catch or drag when the joint is perfectly straight that is ok if the shaft has been in service for over a hundred thousand miles. You should not feel any catches or rough spots anywhere off center, however. The shaft has to be seperated from the other part for you to get the subtle feel. This is sort of hard to explain. I hope it is clear.

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