Have a slight problem, I have a 1990 Celebrity Mercuiser motor Alpha One outdrive. In idle with the steering wheel straight ahead there is no noise, you turn the steering wheel either right or left and there is a very loud bearing type humming noise. Also when you are driving the boat at just about any speed and you adjust the trim up the noise goes away, I have heard that it is the U joint in the driveshaft but I wanted to get some other input on this problem. Any help would be awesome. Thanks