The contact owns a 2014 Ford F-150. The contact stated that while driving at 55 MPH, the transmission unexpectedly downshifted from the 6th to 2nd gear, and the rear wheels locked up, causing the vehicle to slide to a stop. The vehicle then stalled but was restarted after several attempts. The contact stated that once the vehicle was restarted, there was a knocking sound coming from the engine compartment with smoke exiting from the tailpipe. The vehicle was taken to the residence, where a handheld diagnostic machine retrieved undisclosed codes. The vehicle was not diagnosed or repaired. The contact then received notification of NHTSA Campaign Number: 24V444000 (Power Train). The manufacturer was not notified of the failure. The failure mileage was 217,000.