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Hello, I'm Brandon.
That is correct. The transmission working too hard and the transmission fluid is overheating due to heavy load.
When was the last time you did the transmission fluid change. If not, you should do one.
This is the only way to protect the transmission from overheating.
For now, you will need to cool down the vehicle and drive in cruising speed at 60 MPH.
Please rate me positive for the prompt service. Thank you!