According to edmunds, with an all-new model scheduled for '05, there are few changes for the 2004 Ford Mustang. All models wear commemorative 40th anniversary exterior badging, while V6 and GT models can be ordered with a full 40th anniversary package that includes additional exterior and interior enhancements.
The Ford Mustang debuted in April of 1964 as either a coupe or convertible with six or eight cylinders under the hood, and became a national sensation. Ford sold hundreds of thousands of Mustangs, convincing General Motors and Chrysler Corporation to release their own variations on the theme. By the late 1960s, the Mustang competed against the AMC Javelin, Chevrolet Camaro, Plymouth Barracuda and Pontiac Firebird. But, like Elvis Presley, the Mustang had evolved from lightweight and simple agile to overweight and cumbersome. By the time the oil crisis of 1973 hit, the Mustang had lost its edge in terms of performance and appeal. Reborn for 1974, the much smaller Mustang II rode on a Pinto platform to save development costs and improve fuel economy.
Download 2004 Ford Mustang Owners Manual