The contact owns a 2022 Toyota Tundra. The contact stated that while attempting to drive from a complete stop uphill, the vehicle hesitated to respond and experienced a hard shift from the transmission while responding. There was no warning light illuminated. The vehicle was taken to the dealer several times; however, the failure could not be duplicated. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was approximately 10,000.