An auto transmission, of course, allows a car to decide whether it needs more speed or power depending on the terrain, road conditions and weight of the vehicle. Because there is a great amount of stress incurred in this arrangement an auto transmission will occasionally need to be replaced or rebuilt. A used Honda auto transmission is certified to make sure that the replaced used part can supple the quality needed. None would wonder that a Honda used part is preeminent. Over the years Honda parts have always ranked high in quality and durability.