The contact owns a 2016 Ford Explorer. The contact stated that while driving at an undisclosed speed, there was a clicking sound coming from the vehicle and then there was an explosion. There was smoke coming from under the hood of the vehicle. The vehicle was towed to an independent mechanic who diagnosed that the PTU, transfer case and differential had exploded. The mechanic informed the contact that the PTU, transfer case and differential needed to be replaced. The vehicle was not repaired and remained at the independent mechanic. The manufacturer was made aware of the failure and advised the contact to file a complaint with NHTSA. The manufacturer informed the contact that the warranty had expired and to research the lemon law. The failure mileage was approximately 85,000.