We just got our boat last year so I don't have much mechanical experience with it(yet). I noticed last year that when I would make a fairly high speed turn that somtimes I could feel a vibration throughout the boat. It was not very bad, but it was definately noticable(to me). I'm guessing some sort of u-joint problem maybe? Could it just be that the engine is trimming too high and causing this?? Can anyone help an I/O dummy? 