About the sound, well, check your fluid level 1st, but each bike, (like a woman) is different in how it feels and sounds.
I have 2 LT's, 2 yrs apart, and they are different each in their own special way.
Neither one shifts quietly, but they do shift smoothly.
Pre-loading the shift can help sometimes, or not.
The weight of the oil can make a difference. I think the spec's call for 80-90W(or real close) but I have heard of some using a 80-140W oil in the trans. Some have added a graphite mix to the oils for better lubrication. Less friction = less heat.