Cooling lines question?

DOUNVME

IHUNTV8S
Joined
Feb 2, 2005
Don't get upset with me just yet! This is for a mustang with an auto trans. I know I should go to the mustang boards but I don't have an account over there and this is a car I am building for my 16 y/o niece. Its what she wanted, so....

Anyways, do any of you know what cooling line on the transmission is the "supply" and "return"? This is an 89GT convertible with the factory 5.0 and factory auto transmission. I am installing a trans cooler but I am going to run it through the radiator also. I am assuming that the supply line will go from the trans in to the TOP fitting on the radiator, then out the BOTTOM fitting, into the trans cooler, then return to the tranny.

How do I identify which line is what at the transmission, or will it matter?
 
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