need your help.my neon is giving me trouble

. ok so here is the problem .on my way home today smoke started to come out the back of my neon . got her home and smelled trans fluid . pulled the dipstick out and no fluid left on it . . jacked it up and no leakes or cracks . so i refill the trans and i walk away for a min or two and i see a puddle under the car . well all my trans fluid is in my coolant overflow tank and pouring out of it . so now i have trans fluid in my engine .