rustystud
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Most all transmission heat comes from the torque converter. When the "stator" is freewheeling (fluid is basically a solid mass) there is not much heat generated. This occurs when the transmission is in final drive usually. The time it is making the most heat is when it is making the most torque (stator is not moving and fluid is spinning around and through the turbine and stator) . This occurs when your coming up through the gears. So if your engine is heating up at highway speeds, it is coming from the engine having to work harder with the overdrive and not the transmission.