1990 e150/6cyl/3 spd auto tranny help

hey, im new here...

i've got a 1990 Ford e150 club wagon. im trying to figure out who much transmission fluid it takes. i dont want to overfill it and i dont have the oringal manual for it.

any ideas?

For a fluid drain, 3.5 to 4 qts. as I recall.