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You need to replace the radiator right away, there is a cooler built into the radiator and if coolant gets into the transmission fluid it will ruin the transmission. I would not drive it at all and take a chance.
The problem is that those radiator are not really repairable like older ones and I would hate to see you try and repair it and take a chance on ruining the transmission.
I have not seen anyone successflly make a permanent repair on those.