Does anyone know which is the return and which is the feed A/T line?

 

The return pipe is the one on the left that bolts to the trans above the differential.

 

awesome! thank you so much for the help! so the feeder line is the short one in the pic and the return is the long one one the left. i am hooking up a temp sensor and i wanted to get the correct reading of the hot fluid coming out the trans, so i will be placing it inline with the short hose on right for accurate measurements. thanks a million!!!!