I had tranny problem a few years ago too.
i would do what LDUB said and make sure you take it to a tranny shop. Make sure to that they cycle thru the gears and then check the fluid levels again before they are done.
I had mine service at PEP boys once and had them do a tranny flush and the idiots only put in 3 qts. it was a complete fubar.
PS. if you need a another one let me know. I have mine from my engine swap sitting in my garage. it had 40,000 mile on it when I put it in and I ran it for another two years maybe put another 20,000 on it, but I doubt it was that much.