i was looking on ebay a few months ago and they had heat exchangers that i think would work good for what your trying to do. it will help warm the tranny and engine up but also cool the tranny if it starts to overheat.
also theres some stuff called nansulate that i've really been wanting to try. It has a r-11 insulation value at three mils thick, so it should do a good job keeping the heat in too. So that the radiator is the only thing that removes heat when needed. You could also coat the differentials if they don't get too hot also.
I was also thinking that using nansulate would reduce under hood temps.
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