1999 GrandAm GT--tranny question

Hello-
I found this sight through a search and it seems great.
I've tried finding this answer by searching the forum with no luck... I realize this is a 'sealed' transmission with 'no need' to check it yourself and add fluid.
However, there has to be a way to do this, it feels as if my tranny is slipping a little and I'd like to check out the fluid level myself and do what I can before having to pay someone big $ for what would be a simple problem a few years ago.
Any and all help would be appreciated.

99 GA GT
3.4 V6
4 Speed Auto.

Thanks-
DS

Anyone??

How can I check my tranny fluid and what is the full level??

Please help

DS