I have a 99 cavalier 2.2 2200 3spd auto::

The stock trans is geared to long. I would I like shorter gears in my 3t40? Do i change the gears or is there a diff year or car with the 3t40 trans that has shorter gears that will bolt up to my motor? Where would i get the gears from ect, ECT. I want to keep my trans not looking into swapping to manual even tho im sure most would say thats the best bet.

Suggestions tips advice greatly appreciated!!

You can't change the gears. But you can changer your final drive and your chain sprocket.
You can change your shift points. And can get a valve body job.