my truck does have a transmission fluid cooler, part of the towing package, etc. I have been thinking about adding a fluid temp sensor.
Why do transmissions overheat when you try to tow in OD?
Heat is certainly a tranny killer, but the problem is slippage.
An automatic tranny has the ability to slip when it is overloaded. When you pile on the pounds or windage, you must run in a lower gear to prevent slippage. There is a clutch pack and also the torque converter is a fluid driven device. When the loads get high, the tranny slips more and the heat builds up.
Even a cooler really doesn't solve the slippage issue much. It just keeps the heat down some.
Heat is a sign that you have slippage.
The cure is to gear down.
