Hello Tone,
(OT Thanks for the speedo cal unit)
To be more accurate, I should have said, more cooling capacity, rather than more cooling. The radiator could be as big as a house and the thermostat will meter in the fluid at the target temperature. The object is not to run 'cooler', but to have more capacity or head space when crawling slowly at high ambiants and low air flows.
The radiator came before the state.
The capacity argument holds for trans temp, also. The built in cooler will slave the trans oil temp to the engine coolant. In the remote trans cooler case, the temp operated bypass will perform the same function.
More temp capacity should enable the trans to operate at spec temps even when the loads are heavy.
Since the trans cooler is built in, I will accept what trans temp comes out for reasons above.
I just like the idea of monitoring such a vital parameter.
I believe Swordy posted he explored the upper ranges to his temp guage in the summertime. My own observations of climbing the Grapevine Hill on US-5 on 100 degree days did not give me confidence that "a system that essentially works fine", is so fine for my needs.
Most consumer systems are built to deal with 80-90% of all possible operating conditions. This is just economics. If we want to play at the edges, we have to add the support system to the basic platform.
As to the fan: I will be able to run the fan full on with slow travel speed.
I do not expect a power boost.
Yes, the package is expensive. It would not be the first time I spent more than the final value might support. Can you not say the same?

Roy