I did a 3.42 to 4.11 on my last car, Camaro SS, and the difference in performance was astounding. You feel it most in the mid range, the engine has a much better mechanical advantage over the wheels. This is a significant loss of fuel economy when driving on highway. If you drive a lot off highway it's not so bad because you can simply shift at lower rpm to compensate, which the higher gear is happy to do.
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