The contact owns a 2019 Ford F-150. The contact stated that whenever the transmission was shifting between 3rd to 4th and 9th to 10th gear, there was a lag while upshifting. The contact stated that while attempting to accelerate while idling, and while driving at various speeds, the vehicle hesitated before accelerating. There were no warning lights illuminated. The vehicle was taken to the dealer and was diagnosed with transmission failure. The contact was informed that the transmission needed to be replaced. The vehicle had been repaired. The manufacturer was made aware of the failure. The manufacturer referred the contact to the NHTSA Hotline to report the failure. The failure mileage was 55,000.