| :Have you ever noticed your rpms in 5th at 80mph? If old diff ratio is 3.69, and new is 4.08 then the revs will go up for the ratio between old and new diff :) RPM you will have at certain speed = RPM you have now * 4.08/3.69
 1990 2+2 Twin Turbo - Sasha - ICQ 2596349
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