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there must be an issue with the transmission cooler this is inside the main engine radiator so it may be blocked or otherwise restricting the flwo of oil through the transmission
I'd suggest to disconnect the oil lines from the rad and once the oil is drained out, use some compressed air to blow through ( if you can the cooler unit)
do not use high pressure anything more than 2-3 psi and you run the risk of popping the cooler and then mixing engine coolant with the transmisson oil
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