The Overdrive Option - Dispelling the Rumors, Myths
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The 4STB overdrive automatic from FB Performance is based on the Ford AOD, but it’s built to handle up to 850 horsepower in a 3,500-pound car. It features a built-in trans brake for you nostalgia draggers (4STB stands for four-speed trans brake), a full manual valve body with a three-speed-forward shift pattern, an electric switch to actuate the overdrive gear, and a solid input shaft (non-lockup). The 4STB is 2 inches longer than the AOD, primarily because of the custom bellhousings used to adapt the tranny to a number of engine applications, including big- and small-block Ford, GM, and Mopar V-8s. View Related Article
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