My V8 Cadillac, as well as most big V8 vehicles comes with transmission and oil cooling as standard, and you could possibly use such a system for pre-warming or drive time warming.
The radiator has two side panels, one for the transmission, one for the engine oil, with in and out routings. The trans/engine oil is then cooled/warmed as it pumps through. You'd have to find a way to tie into your lines/system. All three fluids are kept within a certain range as the radiator is kept within range by the cooling system.
It's meant more for cooling, but in the winter time it also serves to warm both trans/engine oil up too, as the radiator is warmed by antifreeze.
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