External Transmission cooler?

[fmugur]

Any substance changes properties with temperature and I guess in this transmissions the oil properties change significant around 220 F.
I think civdiv in another thread was looking for tranny temperatures.
This morning I connected INPA to the car and drove to work with it.
The weather here is cooler in the last few days. This morning I left the garage with 44 F degrees in both engine and tranny. During the trip I could see the tranny temperature being lower than the engine but catching up. The engine temperature stabilized at 215 F while the transmission temperature was going above the engine temperature.
The range was between 228-239 F while the engine was at 215-217 F. Outside temperature was about 28 F.
I noticed the jerking 2-1 happened only when the temperature was above 230 F or so.
Now, the therm inlet and outlet in realoem is confusing to me. I am not sure if it refers to the heat exchanger or the transmission since the diagram is under Radiator section.
I don't think I have the oil tubes revered in the heat exchanger but after this morning reading I wonder if that's the case.



Is number 1 or number 2 the return line for the transmission in the diagram below?