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Thanks for the suggestion. Prop chatter could very well be what I am hearing. I just went out and pushed in on the prop and it will push in about a quarter of an inch and spring back out. If I do this fast enough it makes a heavy knocking sound.

When I installed the prop I torqued it to 50 pounds and it just started to crush the spacer and I stopped. I am not sure if this has anything to do with it or if the prop was designed to push in on the shaft like I described but this could very well be what I am hearing.