Couple of thoughts on this , just in general ...
Does the auto box have a breather valve , is it clear
The gearboxes that re occur and leak again could it be a fluid boil condition that creates gas build up pressure which escapes at the easy point .. ie gearbox out put seal .
I also understand that it could be a design flaw .
Years ago we had a old v6 Granada that when the owner towed his caravan up some big hill the box would leak from the torque converter seal , this was replaced but it leaked again whenever the caravan was on tow .
We fitted an air fed gearbox oil cooler and it never leaked again after that , this was in the days when the only auto trans oil was the dextron
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