Where it the location of the Automatic transmission drain plug? Pictures would also help...

Is it the inverted screw on the bottom of the tranny? (There are alot of socket screws down there, and one is slightly larger and the pattern is inverted, on the inside of the head)

 

yes, the larger one that is inverted is the drain plug. you can fit a ratchet in there without a socket on it. it is towards the from from the axel.