Where is the play?
Grasp the shaft just behind the yokes and twist. There should be almost no rotational play in the uni. I like to use replacement u-joints with low profile zerks in the caps. They should last longer than the "factory sealed for short life" non greasable originals.
The splined plunge joint in the middle of the prop shaft is the same idea. Grab it on both sides of the joint and twist your hands in opposite directions. A small amount of play in the splines of the plunge joint is acceptable.
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