NHTSA Complaint #11634895 — 2018 FORD EXPEDITION

I was on a road trip of about 900 miles. My vehicle at the time had 103,000 miles. All maintenance service intervals had been complied with since I purchased vehicle new. About half way through the trip the transmission started acting up. I was on the highway between 75 and 80 mph when it suddenly downshifted in a jerk then it failed to accelerate. This whole time I was pressing the gas pedal and my speed continued to drop and the vehicle jerking forward and back. I was able to put it in “manual” selectable speed and regain control. I had the vehicle inspected at my destination and the dealer could find no fault codes and fluid check was good. My vehicle continued random jerky shift changes at the most dangerous times. I still got no check engine light or any such failure or service alerts. On my return trip home, it did it again. This time I was watching all the gauges. I noticed my engine coolant temp spike to 240 degrees and my transmission fluid temp spiked at 247degrees. Outside air temp was 40 degrees and it was three occupants and no towing involved. The dangerous jerking and random transmission shift changes continued. After about 30 minutes of reduced speed driving on the highway the temps dropped. However the shifting was hard and erratic. I took the vehicle to the dealer after returning home. I now need a whole new transmission. This situation was extremely dangerous as to the uncontrollability of the slam shifting of the gears causing a rapid change of speed. I am very fortunate I was not in a wreck! In my research of this problem, I found I was not alone. It is a terrible design by Ford. It gives no warnings other than slamming you around in the vehicle. Something must be done!