Certified Transmission has one of the most sophisticated remanufacturing centers in the nation. Each transmission is remanufactured with only new parts. state of the art testing equipment guarantees your transmission will be as good as the day it was driven out of the factory. And no matter what kind of transmission you bring in, we have specialists who know it top to bottom. When the safety of you and your family is involved, it's important to know what goes on behind the scenes.