- 1). Count the number of sun gear teeth and the number of ring gear teeth if the planetary gear is set in underdrive with the carrier as the output. Add the two numbers together.
- 2). Divide the resulting number by the number of teeth on the driving member for the gear in underdrive when the carrier is the output. The total is the gear ratio for that gear setting.
- 3). Divide the number of teeth on the driving member by the sum of the sun gear and ring gear teeth on the planetary gear for a system set in overdrive with the carrier as the input. The resulting number is the gear ratio for that transmission setting.
- 4). Count the number of teeth on the driven gear and the number of teeth on the driving gear if the planetary gear is set in underdrive with the carrier held.
- 5). Divide the number of driven gear teeth by the number of driving gear teeth to obtain the gear ratio for this system setting.
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