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On a warm day and a long trip, ATF gets hotter than engine coolant. This fact is derived from working in a service station back in the 1970's. eg. Car Owner: "Fill her up and check the oil." ... Me: "The oil iis a quart low, Sir. And it looks like it's due for a change." Car Owner: "Yeah, I should have changed it before I left, .... How long for an oil change." "We're almost done with the one in the first bay. Should be less than 1/2 hour." With the car on the hoist, the transmissions were always obviously physically hotter than the radiator.
FWIW. In the 1980 I operated a specialized 6x6 20 ton vibroseis truck with automatic transmission. On 100F air temp days, the transmission oil temp ran around 280F-290F. Engine oil temp ran about 220F. Engine coolant temp ran around 200F.
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