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Pinion Mesh Diagram

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In general, you want the pinion to mesh near the center of the face of the ring gear tooth. That is, it should be about centered heel to toe, and centered top to root. Note also there is a drive and coast side to the ring gear teeth. The drive side is the more critical pattern of the two. Examples of possible gear mesh patterns can be found with the gear installation instructions that come with a new gear set.