Final output on all non overdrive transmissions is 1:1. There's no difference at all between them. As said above an overdrive trans or a higher ratio rear end are you best options.
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1964 Malibu SS, now a LS1 and T56, Back halfed, rollbar, narrowed 9 inch, 4.11 gears and 31x16x15 Mickey SSR's on Weld wheels.
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