which ford plant make the mustang
All-New 2015 Ford Mustang Begins Production at Flat Rock Assembly Plant; Marks Global Availability of Iconic Pony Car. 2015 Mustang starts production at Fordâs Flat Rock Assembly Plant; car to be exported globally for the first time in its 50-year history. New Mustang goes on sale this fall in the United States, and in more than 120 countries next year.