What is the difference between a 1964 1/2 Mustang and a 1965 Mustang?
There actually aren’t any Mustangs that are stamped “1964”. They all carry a “5” in the VIN number, designating a “1965”. Mustang Coupe and Convertible production began in April 1964. It is still unclear as to exactly when Fastback production started, but it appears to be sometime in the summer of 1964. The first Coupes and Convertibles that were manufactured had the engine codes C, D, F, K or U. When the early D, F and U engines were being phased out, the Fastback production was just beginning. As the first Fastbacks rolled down the assembly line, some may have been outfitted with the last remaining early engines available. Therefore, the first Fastbacks may have had engine codes D, F or U. As production continued and these early engines ran out, engines with codes A, C, K and T were used. The K code engine was available from 1964 up until 1967. It can be difficult to prove a true 1964 1/2 Mustang, but any early Mustang with a D, F or U engine code is definitely a 1964 1/2 Mustang. Mu
