Transmission cooler line connections from transmission to radiator

With braided lines, in and out are the only concern. The factory lines are long and short. It doesn't matter which is in and out, it only matters that it goes in, gets cooled, returns to the transmission. If your adding a cooler, know whichis oput of the transmission. Route to radiator first where it will get cooled down a bit and then onto the external cooler, which should be mounted in front of the radiator to get cooled down further via cold air rushing over the cooling fin's. NOT the other way around. The radiator could re warm the fluid. COULD!