The contact owns a 2019 Toyota Highlander. The contact stated that while driving at an undisclosed speed, the vehicle started shuddering, prompting the contact to pull over to the shoulder of the roadway where the failure persisted. No warning lights were illuminated. The vehicle was taken to an independent mechanic, who diagnosed a failure with the transmission. The contact was informed that the transmission needed to be replaced. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was 88,000.