thats pretty normal. your in lock up most of the time, and in lock up thats how we cool the trans down. trans oil heats up by way of torque converter. the sheering effect of the fluid from crank to trans input shaft causes heat build up. so the constant up and down shifting and city driving, mountain driving from shifting frequently is the real killer. steady driving trans is in lock up where the clutch inside the torque converter is applied just like a manual clutch and there is no sheering so the fluid stays cool. if it were broke the light would come on. we monitor it. from cold to hot the temp must move and move in a certain amount of time and according to driving conditions and ambient temps.
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