NHTSA Complaint #11663376 — 2017 FORD F-350 SD

While driving my 2017 Ford F-350 equipped with the 6R140 transmission, the vehicle experienced a sudden and complete transmission failure due to a valve body malfunction. Without warning, the transmission lost all ability to engage gears, resulting in an immediate loss of power and drivability. This failure occurred while the vehicle was in motion, presenting a serious safety risk to both occupants and other motorists — especially in high-speed or high-traffic situations. The risk is further compounded when the vehicle is towing, as it may increase stopping distance, reduce control, and leave the driver stranded in unsafe conditions. This type of failure appears to be part of a broader pattern affecting this transmission platform, which raises significant concerns about its reliability and safe operation under normal usage. There were warning lights or other symptoms prior to the failure. The damage has since been remedied, with an astounding out of pocket cost of $8,300 for a total transmission rebuild.