Mopar Forums - 904 auto. trans. wont shift into gear?

Hey my 73 Chargers 904 Automatic Transmission has been leaking fluid for years now because I havent driven it and the other day I went to back in out of the garage but it wouldnt go into any gear. I checked the fluid and it was almost completey out so I put almost 5 quarts in and ran it and tried it again and the shifter shifts into gears, but the car wont move. The parking brake is off, so I dont know why it wont go in any gear so I can move it? Any thoughts?
PS its been sitting in my garage for 8 years just now getting to work on it.