1964-1978
As far as legends go, it's hard to compare the first-generation Mustang. From the record-breaking sales of the first Mustang pony cars in 1964, to the muscle car madness of the late 60's, to the wheezing carb-restricted big bodies of 1973, no generation of Mustang had a more dramatic transformation than the first generation.
The second generation carried the unfortunate torch and is considered the least desirable of all Mustang eras. Ford hit some runs with its performance versions like the Boss and Mach 1 Mustangs but the biggest jump is when racecar driver Caroll Shelby took the mustang from a "secretary's car" to one of the most iconic and sought after Mustangs in history. This has less to do with Mustangs and Ford for that matter and more to do with the stricter emissions due to the gas crises of the 1970s. NO manufacturer was putting out enthusiast-focused automobiles.
Key iterations:
1964 1/2: - The inception
Shelby: - 1965-1970* (*69-70 Through Ford) GT350 /GT500
Mach 1: - 1969-1978
Boss 302 & 429: 1969 - 1970
King Cobra: 1978

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