The websites that i get the best information from, all read that the transmission temperature should be the same as the engine oil temperature
A segment exclusive on the 2013 Ram 1500 is a new thermal management system
, designed to quickly raise the transmission fluid temperatures to cut parasitic losses and wear, improving fuel efficiency by 1.7%. It is enabled by an electronic thermostat which constantly monitors antifreeze temperature; once it’s hot enough, warm engine coolant is circulated through a thermal exchange unit which heats up the transmission fluid. In most vehicles, the transmission heats up independently of the engine. (The system also works for engine oil.)
Chrysler’s Dave Sowers said:
We get benefit from bringing both of them [oil and transmission fluid] up to operating temperature faster. The primary benefit comes in the transmission. In colder climates, you could drive a vehicle for hours in the winter and the transmission might never reach that 190° (F) for the most efficient operation.
So what we do is use some of that hot engine coolant through the heat exchanger to bring it up to 190° as quickly as possible, and that gives us efficient operation very quickly.
Original is at 2013-2014 Dodge Ram 1500 engine, transmission, and axles (powertrain) http://www.allpar.com/model/ram/dodg...#ixzz2qV5TRk86
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