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That is strange. In the old days automatics had a lower ration so using an automatic gearing resulted in higher engine speeds.
I like your idea. I was designing a belly pan to achieve the same thing by letting the exhaust pipes heat the transmission in a rear wheel drive. I have yet to complete it but I think it would have needed a louvered lower grill block to allow the engine to actually heat up before 10 miles.
Personally I would use an electric block heater to preheat the engine and trans-axle if electricity is cheap where you live. Finding a way to heat the trans-axle with coolant is the real challenge.
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