The contact owns a 2019 GMC Sierra 1500. The contact stated while accelerating from a complete stop, the vehicle hesitated and the transmission experienced a hard shift to first gear. Additionally, the contact stated that the vehicle was shuddering while driving at slower speeds. There was no warning light illuminated. The vehicle was taken to the dealer but was not diagnosed or repaired. The manufacturer was notified of the failure and informed the contact that the VIN was not included in a related recall. The failure mileage was approximately 38,000.