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The new Dodge trucks have a thermostat on the trans fluid coolant lines to block its flow until the trans reaches operating temp of around 180. Now this is an automatic, which makes controlling the coolant temp simpler. I put a similar thermostat purchased from Jegs on the automatic coolant lines on my old Dodge, which has a standard 904 Torqueflight, but would be hard pressed to tell if it improved the mileage. However, Dodge (now Ram) claims the thermostat on the trucks did improve mileage. For what it is worth.
Before putting the 904 back in the Dodge, I had installed a1987 Ford T-5 five speed, which used automatic transmission fluid, and not heavy gear oil. I think the advice about synthetic is probably a good one. I went back to the 904 when my old knees got balky, and I stopped driving it with the stick shift.
Sam
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