MountainNavyMom

Please help me solve my a transmission problem with my 2000 Dodge Durango. Transmission went out this year at 140,000 miles. We had a transmission shop rebuild the transmission.
Picked up car from mechanic and started to drive home. I live in the mountains; the car made it to 4000 ft and the check engine light went on and the car was stuck in third gear. I had the pedal to the floor; it would not go over 30 to 40 MPH (depending on the incline). I returned the car to the shop, the mechanic he said the check engine light error message read that is was overheating. He claimed it was not overheating and drove the car for a week (twice up the mountain) and it ran fine. I picked up the car and drove home and the exact problem reoccurred at 4000ft, same area.
Returned car to mechanic and he replaced the computer. Picked up car drove it home and the exact problem reoccurred, this time at 4500ft. Returned car again and he said that it might be a faulty computer from the factory. He ordered a new one and replaced the computer. Drove car home and it worked fine, made it up the mountain. I drove the car three days later down the mountain and on the way back up the mountain I had the exact same problem again at 4500 ft.
I don’t know what to do, we paid $3000 dollars for a new transmission and it still does not work. The mechanic doesn’t seem to be able to fix the problem, does anyone have any suggestions?’

hundahunta

did they reverse flush the trans cooler is it plugged??