The contact owns a 2018 Chevrolet Silverado 1500. The contact stated that the vehicle was vibrating abnormally while driving 45 MPH. There were no warning lights illuminated. The vehicle was taken to an independent mechanic who determined that the brake pads and rotors needed to be replaced. The mechanic later determined that the torque converter needed to be replaced. The local dealer was contacted, and determined there were no recalls on the VIN related to the failure. The vehicle was not diagnosed or repaired. The manufacturer was contacted and confirmed that there was no recall coverage for the failure. The failure mileage was approximately 75,000.