Join Date: Aug 2016
Location: South NM
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Knowing this, why would RAM install this? When just using straight lines, it would be much cheaper.
As BFD brought up, its to help the oil reach a set operating temperature. However, we all know that the cooler an Automatic the better. So, why would RAM want it at a set temperature?
Hotter oil flows better and "sucks" less power than cold oil. Also, you want the transmission to get hot enough to evaporate any water in the oil. Finally you have thermal heat transfer. The hot oil needs to remain in the cooler long enough for the air to extract the heat. Move the fluid too fast, and not all the heat will be removed. You may not notice this when operating under the limits of the cooler or not making heat in the transmission. However, under extreme conditions, the thermostat based system may cool better.
Finally, the transmission shifts differently based on temperature. When cold, it holds the lower gears longer. If you live in a cold climate it will take much longer for trans to reach this set temperature, affecting your MPG.
As I live just north of actual HELL, I'll delete my transmission thermostat.
I'm a firm believer that a cool transmision is a happy transmission.
2014 RAM HD. Cummins 6.7 364.5SXE Turbo. EZLynk Tuned. Straight piped. Air-Ride.