what a good question. I have no idea and have to think for a while and would have to investigate heat echangers.
one thing to keep in mind is I "believe" (those who read the alignment thread know what my thoughts are worth - not much) that the ideal operating temp is somewhere around 150F. Just high enough to get the TC to lock up, but not so much as to markedly degrade the life expectancy of the ATF.
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