The Feb issue of MMFF Horses Mouth section explains this "the mustang shared ther 3.8 engine with the Windstar and when Ford launched the minivans repalcement, the Freestar, it changed the engine slightly and it became a 3.9 . Even thought the Mustang only had a short model yearleft, they were forced to follow suit with the change. As it turns out , most of the 04 v6 Mustangs built feature the 3.9, which is the same engine,justa with a slight overbore. Horsepower is said to be the same with the miniscule increase in displacement."
Production #s
04 Mustang 3.8L =17,842
04 Mustang 3.9L =74,972
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