The radiator female fitting is a 5/16 female flare, (threads are 7/16-20 fine thread).
The transmission case is tapped for a 1/2-20 fine thread fitting with a gasket surface machined for sealing the fitting. A gasketed adapter for the 5/16 male flare screws into the transmission.
In the pic, the transmission fitting is on the left and a 5/16 male flare fitting is on the right. If you are adapting a larger line, than an adapter to a 5/16 flare fitting might be the easy way to go.
Jim
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