The Ford Mustang Mach 1 was a performance focused version of the 1969-1970 Ford Mustang. The Mach 1 was first introduced as an optional performance package that debuted for the 1969 model year. This performance package was only available on the fastback body style and included a standard 351 cubic inch (5.8L) V8 engine and standard 3 speed manual transmission. More powerful V8 units, including the 428 Cobra Jet, were also offered, as well as a 4 speed manual and 3 speed automatic. When the Mustang received an update for the 1971 model year, the Mach 1 continued production as the 1971-1973 Ford Mustang Mach 1.