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Selecting Differential Gears. This chart is from Jeff's Bronco Graveyard. Note it is calibrated for a cruise speed of 55 MPH. If you normally cruise at 65 MPH then the numbers 4 columns to the left are close. For ex . for 35 inch tires at a 65 MPH cruise use the numbers under the column for 31 inch tires. OR, recalculate using the formula above.
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