did you fill the tranny back up to full? or did you just put a quart in it? It won't go without any fluid in it. On my old truck the dipstick tube randomly popped loose and leaked like crazy. That was about 5000 miles after a rebuild. Before that when it was goind out, it would just barely creep into drive or reverse, so who knows, maybe yours died. All it took for my leak though was a new O-ring. See if you can pinpoint where it's leaking, and let us know. That might help some.
When my 700R4 went out on my 92 I have now, I still had all my gears, but it wouldn't shift til I hit the redline in every gear, and it would chirp the tires going into second cuz it shifted so damn hard. So I don't think yours is dead.