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With the block heater did it start ok at -12? Once it warms up I bet you would have some extra turbo boost with air that dense.

Allison guide says it could be a plugged vent or drain back holes plugged up. I found something else online not for this specific trans but an Allison truck trans that said in cold weather viscous fluid could build up by the vent and as the trans comes up to temp, expansion can push it out the...

Its been really cold the last 2 nights. Like 10 degrees. The fluid/oil is probably pretty thick at that point. There may be a safety relief somewhere on the trans for excess pressure. The transfer case is all wheel drive with a computer controlled power split and cannot be put into neutral...