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To calculate the Drive Ratio for a quick change, divide the number of teeth in the top gear by the teeth in the bottom gear for the QC ratio, multiply that by the axle ratio (ring and pinion ratio of the QC rearend) and you have the Drive Ratio. For OEM-type rearends, you divide the number of teeth in the ring gear by the number of teeth in the pinion gear for the Drive Ratio. View Related Article
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