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Speedometer gear calculator turbo 3506/14/2023 This adjustment can allow you to set the speed correctly without a gear change. Also some modern electronic speedometers allow a PULSE count to be set. So if your at 7.9 teeth, use a gear of 8 teeth. So if you have a 'Computed' Diameter of 25.75" for a tire, the loaded rolling diameter might be less, and so best method to get the number is to MEASURE IT! The output from the calculator is a floating point number which is done to give you a feeling of whether to round up (More teeth) or round down (Less teeth). The Diameter of most (Yes even GTSparkpulugs) Calculators give the size of the tire unloaded. One other thing to watch out for is the size of your tire. Other values are said to be stamped on the back of the Speedometer itself. For electronic speedometers this seems to be the common case. From poking around the web it seems many modern speedo's run 1000 RPM and display 60 MPH. ![]() What you will need to find is the magic number that your speedometer really needs to turn. This calculator allows you to find a close gear set that will make it all happen. Many speedometers have a given RPM they must turn at 60mph to be correct. How to calculate your speedometer gear & rear axle ratio. This simple calculator does the math to help figure out the 2 gears that are needed to make your speedometer work correctly. Chevy TH350/TH400 Common Transmission Leak Fix (and Fix the Speedometer Too).
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