There it is. New core and all fittings resoldered. Original transmission oli heater/cooler functionality. Discussed it with the rebuilder and opted for the original 3 core even if there is “room” for more. Theory is that 3 rows should be way more than needled, and more rows would take more air pressure (aka fan) to be efficient. Aluminium build was tempting but less efficiency and less resistance to mechanics did not make the weight reduction worth the cost
Original core was clogged inside out and the cooling fins was no longer properly thermally connected due to corrosion.
New thing will cool.
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