that's the 1.62 ratio, used for 5.0L engines, it has the same amount of teeth on the drive gear and driven gear. If you are using it on a 5.7L you need the 1.5 ratio, and like i said, if its going behind that 383, you need to stay with factory mercury HD 1.5 gears(they offer a 1.32 gear set, but its not as strong as the 1.5)
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