Originally Posted by techntrek
It would be odd if Ford now regulates the minimum tranny temps. All the research I did before I added my additional cooler says that you can't cool a tranny too much. The lower you go, the longer it lasts.
With the bitter cold now in place I kept an eye on my temps yesterday and today. At highway speeds it hovered around 100 F once it was fully warmed up, plus or minus a few degrees. It slowly warmed while stopped. I wish I could maintain that temperature going up a steep slog!
Well, they are not regulating a minimum temp, it is not like they add a heater to the cooling circuit, the tranny will do it, even if it takes a while in very cold temps. The thermostat in the Ford 6 speed torqeshift does not even send fluid to the cooler until it reaches 190F. It also will not go into 6th if the temp is too low, viscosity rules inside a hydraulically actuated machine that is a transmission. I would imagine GM also uses some sort of thermostat as well. I am sure dodge uses duct tape and popsicle sticks...