If you read the install instructions, they reference 2 other options...one of which "only" drops 20 degrees of temp.
20 degrees would make me feel better....while I get that some of the suggestions are strictly for mpg, I still think there is something to warmer fluid being better than colder. Just like why I go easy on my engine until the oil gets above 130 or 140.
I couldn't decide which option I wanted, so that's why i removed the thermostatic spring valve behind the plastic end plug. This is an observation since the removal.
The valve controls the flow from both the heater and the cooler. When removed the transmission gets FULL flow heat and FULL flow cooling.When the vehicle is under a light load(driving down the highway) the cooling effect will overcome the heater and you will have lower than normal temps. But! The effect can be reversed if the vehicle is under load (towing or driving aggressively). The heat from the engine will combine with the heat created by the transmission and over come the cold flow from the trans cooler. Your transmission temps will continue to go up as the engine temp goes up.
That's why Revmax gives you options, it depends on how much load you will put on the transmission. If you drive the **** out of the truck then you want it to cool, but if you drive alot of highway and want efficiency then you want the higher temps.
Now the gamechanger is the blocking plate, because this takes the heater out of the equation. No more unwanted heat from the engine coolant