The contact owns a 2020 Ford Ranger. The contact stated that while the vehicle was in reverse(R), the vehicle jerked before the transmission responded as needed. The contact stated that the vehicle returned to normal functionality afterwards. No warning lights were illuminated. The vehicle was taken to the dealer where it was diagnosed that the gear shifter assembly needed to be replaced. The vehicle was not repaired. The contact stated that on a separate occasion, while driving 50 MPH, there was an abnormal humming sound coming from the vehicle before the transmission unexpectedly downshifted. The contact stated that unknown warning lights were intermittently illuminated. The vehicle was taken to a dealer and was diagnosed with an internal leak in the transmission which caused the failure. The contact was informed that the transmission needed to be replaced. The vehicle was not repaired after the latest failure. The manufacturer was contacted and opened a case. The contact related the failure to Ford Campaign Number: 242046. The failure mileage was approximately 77,000.