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Rearend GearsChanging the rear differential gears in your Mustang to a lower (though numerically higher) ratio will give your car greater torque multiplication, and that will allow it to accelerate more quickly. Stock 5-L Mustangs were equipped with 2.73, 3.08, or 3.27 gears, while later '96-present models get a standard 3.27 ratio, save for the '03 Cobra that has 3.55s. In most cases 3.73 are optimum for either a 5.0 or 4.6 2-valve Mustang, unless a taller tire is used. If the latter is true (or you have a '96-01 Cobra), a 4.10 might be the best way to go. Either way, you can expect a reduction of .2 to .4 of a second in the quarter-mile after installing your new gears. View Related Article
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