From what I understand, and I may be wrong, the drive shaft should not have play in it around the strut. That is, if it is moving around in the strut when you are pulling back and forth on it, I would say that the bushing is probably worn out. (the strut what hangs down under the boat to support the shaft). That bushing is a maintenance item that is supposed to be replaced at certain intervals. At least it was for my previous boat. (89 supra comp)Also, I'm refering to it moving when you push it up and down and side to side. I doubt it would take much play to create a vibration and the faster you go, the less you might notice it. Just some ideas........
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