[gumby79]

With my 6sp(7 counting TC lockup) Allison, 145°f to enter learning mode. Per the Trans Builder keep it above 145°f to keep it alive and adjusting the shift trims for current conditions.

Dodge put out a TSB about transmission fluid viscosity issues. At -10 F the ATF+4 trans fluid congeals/ freezes in the air to liquid cooler mounted in the cooling stack, restricting flow through the cooler circuit causing the transmission to overheat.
I have not gotten a straight answer at what temp this is a problem with Allison fluid. Dodges fix was to bypass the air unit and just use the massave remote liquid the liquid unit bolted to the side of the block using a heater core circuit. And tell the customer to swap back and forth for towing in hot and solo in cold.

Final advice I implemented routing.
Stock is:
Trans/water/air/trans

Recommended:
Trans/air/water/trans

Reasons:
Industrial Allison standalone computer locks the TC@ 20mph ~1/2 way through 2nd. So no TC heat, it will(my Allison) run too cold and seldom be in learning mode especially in MT winter. So far single digits trans temp 161° F/ CT,171. Without pulling heat from the Cummins the Allison would not be happy. And the worst of winter is yet to come.

Find out what temp your TCM enables learning. That is the magic low temp, bottom line.
If it is all hydraulic mechanical so long as it's not overheated it doesn't care . However the TCM from the 46RH that came out did disable the electrohydraulic OD (.61/2.44 final) till the trans hit 45°f ~1.5 mi @ -20F when pluged in CT ~60°F

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+1 on the user selectable raito and #of shifts available CVT shift patterns. I still dont get the point of a CVT with set shift raitos , especially it described here to match a normal automatic . Only thing I can come up with is too many complaints about people feeling like they're driving a snowmobile with three RPMs accelerating, cruising, and compression braking.