The 6LXX family is a series of 6-speed longitudinally-mounted automatic transmissions produced by General Motors. The 6L80 and 6L90 were assembled at GM Powertrain plants in Ypsilanti, MI, Toledo, Ohio and Silao, Guanajuato, Mexico, while the smaller 6L45 and 6L50 were produced at those same Toledo and Silao plants, as well as at a GM Powertrain plant in Strasbourg, France. From Wikipedia
