Transmission cooler lines...which one is the return line?

[sext7366]

The only reference for the transmission cooler lines I can find is for a hemi engine with an external cooler.  From what it does show I am guessing the line going farthest back on the transmission is the return line (it connects to the passenger side of the radiator, but I'd figured I better check.  The reason I need yo know is that I am installing an external transmission cooler to use along with the radiator's cooler.

[is_it_EVER_done?]

Yes, the furthest back line is the return,