Transmission noise
Jim, I do hear a noise in the lazarette(sp) video but it doesn't sound to me like the clear noise of a failing thrust bearing. I do admit however that I've never been very good at identifying noises on videos.
I do encourage you to separate the prop shaft from the output coupling before getting involved in any heavy maintenance. If the thrust bearing is failed far enough to be the cause of your noise and vibration, I think that you would surely hear and feel something in the back of the transmission when running in forward at the same RPM. Don
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