According to Ford production records researched by Kevin Marti, Ford produced eleven 1970 Mach 1 Mustangs with a 428 CJ engine, 4-speed transmission, and air conditioning. All were produced fairly late in the model year, with eight produced at Dearborn, one produced at San Jose, and two produced at Metuchen. Five of the cars were Q codes, and six were R codes. All were equipped with 3.25:1 rear gears; two were limited slip (code "R") and nine were open (code "9"), and only one was equipped with a factory tachometer. All eleven of the VINs are known to the registry, but the location and condition of some of these cars is still a mystery. There are many written reports that describe how air conditioning couldn't be ordered with a 428 CJ and 4-speed transmission in 1970, but towards the end of the model year Ford definitely let a few slip through.