My 04' 450 always give a little rattle from the bottom end when I shut it down. It has done this since I've owned it (August). I'm just wondering if its just in the tranny/gears, or if I might need to take a look at my counter-balance bearings (the only ones i forgot to really check when I had the cases apart last time). I don't really want to split cases again if it's nothing to worry about. Anybody know?