transmission return line location
 

I found the location of the transmission lines on the radiator....one at the top of the radiator and the other near the bottom. I'm trying to figure out which is the return line to the transmission. I have a 2003 f150http://images.intellitxt.com/ast/adTypes/2_bing.gif 4.6L. I'd appreciate any help. Thanks.

the bottom one is the return line. it goes in the top of the radiator cools off then goes out the bottom