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Originally Posted by EH819
Good post.
Anyone know the rpm difference between 3.73s and 4.10s at 70mph in 5th gear? I would like to go with 4.10s in the future, but I do take the car on some decently long trips and don't want my gas mileage to go completely down the tubes.
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To find your speed at any given RPM with a 4:10, just triple your RPM reading (2500 X 3 = 7500) and then decimalize that number (7500 divided by 100 = 75.00, or 75) to get your miles per hour. In order to figure out RPMs at a given speed, just reverse the above calculation. This is an old hot rodders trick and works very well.