Calculate Final Drive Ratio. If your tires are bigger than stock you probably, like myself, have spend a lot of time trying to. Calculate a car's theoretical speed for each gear ratio given final drive ratio, gear ratio, engine rpm, and tire circumference.
Most overdrive trannies have a similar or low first gear and then, of course have the final drive gear ratio that is less than 1:1. 25 x 43 = 1075. In our example, dividing the 30.
Depending on your assignment, you may write your answer as a decimal, a fraction, or in ratio form (i.e., x : Can someone please give me the formula to calculate the final drive ratio? Select transfer case from the drop down list or, if it's not in the list and you know the gear ratios of your transfer case, enter them below.
Divide the driven gear teeth by the drive gear teeth. Solve for your transmission ratio. For example, one of my cars has a 36t diff pulley and a 16t center pulley.
With this transmission's first gear ratio of 2.74 combined with a 3.73 axle ratio, the final drive ratio >> yields a 10.22 (2.74 x 3.73 = 10.22). Gear ratios are typically expressed in z:1 (2.055:1 for example). In our example, dividing the 30.
Also calculated is the new gearing you would need in order to return. Here’s the formula for calculating gear ratio: Calculating the final drive ratio.
To figure out the final drive number, do the math: Final drive ratio understanding final drive ratio. Calculate a car's theoretical speed for each gear ratio given final drive ratio, gear ratio, engine rpm, and tire circumference.
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