slipping and whining

[outside the wake]

I had our youth group out last evening and had 4 in the boat and 4 on two tubes. I began to notice a slip when I was going hard on turns and also noticed a metally sounding whine at slow speeds coming from the transmission. The combination of the two had me going back to the dock. I have since talked to a friend that told me the prop slipping was cavitation. I checked the transmission fluid and it appears OK. The shaft was dripping water way to fast (stream) so I need to adjust it. That wouldnt have anything to do with either of these issues would it? I am a little skittish as this is my first inboard and as a long time boat owner I am pretty sensitive to strange noises. The boat had 100 hrs on it when I bought it. It is a 2004. I had to take it back because of a vibration and the prop was tuned which stopped it. I am hoping the previous owner did not drive it that way very long and screw anything else up. I bought it this spring and have put 50 hours on it and love it. Do any of you have any experience with either of these problems?

[Jimmy Buffett]

How long has it been since you changed the tranny fluid?

[outside the wake]

How long has it been since you changed the tranny fluid?

I talked with the service manager and he agreed the slipping is probably some cavitation, he said the packing being loose can sometimes create a whistle, I am going to tighted that and see if it quits, if not I thought I would change the tranny fluid. the boat has 150 hours on it 50 of those with me. The dealer was supposed to have serviced it but I doubt they changed it. thanks for your reply