The hottest temp is the line going to the cooler. As the fluid has already did it's work and picked up the temperature. The coolest temp is the line coming from the cooler back into the tranny. It has lost it's temp. The pan temp is about an avenge temp of the whole tranny. On my Power Wagon. I had placed the temp sensor in different locations over the years. I'm happy with it sitting in the pan for now. I've seen temps over 300F coming out of the tranny.
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