Your tranny needs to get up to 50degrees F in order for the TCM to allow OD to engage. The frist Nebraska winter my '99 R/T saw when i came back home to visit my parents, it took about 1/2 hour of driving before it finally kicked into OD and that was at highway speeds. The outside temp was hovering around zero and that was running the stock tranny cooler in radiator and factory aux cooler. On my '00 with just the external Tru-cool tranny cooler and thermal bypass it doesn't take but 1 mile of driving, even in sub zero temps for the tranny to shift into OD.My 42re wouldn't shift into OD all the time in the winter. I've made hour long trips at 3000rpm because it wouldn't shift.
Maybe your definition of super fucking cold, and my definition of super fucking cold are different :jester: