The Ram has a new feature to me, it has a transmission temperature display. Towing our travel trailer, I was a little surprised that the change in ATF temperature was very little, maybe 210 if it was going up a hill, but even without towing it usually hangs around 200 degrees. That got me thinking, what condition would keep the ATF coolest? Going up a hill at a lower RPM in higher gear, or going up a hill in higher gear? As near as I can tell, the tow/haul mode usually keeps the torque converter locked.