Had the Rinker out on Saturday, and I noticed that the new drives seem to have a little more gear whine than the old ones. The upper units are the same, only the lowers have been changed. Its not an alarming sound, just a gears whirring sort of noise. Is that normal? I've been listening to this boat for 7 years now, and this is a new sound to me, but its also the first year with these drives.