727 filler tube leaking

Sometime it is the shift shaft seal that is leaking and is confused as the dip stick tube... Take a white paper towl and touch the casing around were the shifter linkage goes on... If it comes out with trans fluid on it that will be were the leak is, and it's running down around the dip stick tube... You will have to drain the pan and remove the valve body and install a new shift shaft seal from the inside of the casing... onecatnodog