Toyota Motor Corp.’s $12 billion gearbox maker is planning to shutter its U.S. operations and move its production to China

Toyota Motor Inc. said Tuesday it will shut down its U,S.plants and move production to a Chinese plant, raising concerns about a potential slowdown in the U.K. auto maker’s production growth in the past year.Toyota Motor Co. said the move is expected to start early next year, and the plants will be shuttered from late…