The contact owns a 2015 GMC Acadia. The contact stated that while driving at various speeds, the vehicle was shuddering and vibrating while shifting gear, and vehicle failed to properly accelerate. The vehicle was taken to the local dealer who diagnosed that the transmission was faulty and needed to be replaced. The transmission was replaced, and vehicle was repaired. The manufacturer was not notified of the failure. The failure mileage was 90,000. The VIN was not available.