Want to know what gears to choose for your new tires? Or maybe you’re just curious how many RPMs you’re running at a specific speed. This utility helps you figure all that out. It is set up for the 4R100 transmission, but can easily be modified to work with the 5R110 or any other transmission, provided you know what the ration is for each gear. This is a handy utility for drag racers as well as high speed racers that need to know what their engine RPMs are at in specific gears at specific speeds when figuring out tire and gear combinations.
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