Automatic or manual transmission?
In either type, a whine is not normal. Are you sure it's the transmission? Coming from the front of the car? A rear end can whine as well.
Offer some cheese to go with the whine. Sorry, bad joke.
Take it in, as you should have the 100K drivetrain warranty that would cover it.
It is better to keep your mouth closed and let people think you are a fool than to open it and remove all doubt.