So when you grab hold of the shaft and give it a shake you have play in it? Can you tell if it's coming from the ujoint or the pinion? Ujoints are cheap and easy to replace. Might just be a good idea to do it anyway.
Also as a wise Hackle once told me over and over and over again. "It looked tight" is not the right answer.
Also as a wise Hackle once told me over and over and over again. "It looked tight" is not the right answer.