By all means do NOT plug those cooling port lines from the tranny! They are there for a reason and need to be utilized - such as how others suggested getting an aftermarket cooler to put in front of, or behind, the radiator (I say behind because, if that cooler is the only source of oil cooling, it need not be exposed to frigid air temperatures and thus overcool the tranny...but our cars tend to be fair weather cars so putting the cooler in front of the radiator wouldn't hurt.)
That vintage of transmission did not have a locking torque converter clutch, so there's always a level of slip within the torque converter. Slip, under propulsion, creates heat - and can create high oil temperatures very fast. Yes, the earlier transmissions were air-cooled, but I speculate that the automakers learned about the need to keep the oil cooler - and that combined with ever more heavy cars and more powerful engines, they said, "hmm...looks like we need to have a more reliable means of cooling our trannys than with air fins."
Jason.
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