Transmission cooler PLUS radiator?

The OEM tubing was 5/16 with flared ends and nuts. In a previous post someone suggested you replace those OEM fittings with a barbed fitting for neoprene hoses and clamps. I can't confirm that the threads in this radiator are in fact npt type.
I don't think it makes a difference which is in and out / which way the coolant flows through it.