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Note the position of the pattern between the face and flank of the teeth. Since the pattern is centered from face (the top land of the tooth) to flank (the base of the tooth) on the Drive side, the pinion depth for our rear is good to go. If the contact pattern had been more toward the face of the teeth on the ring gear, the pinion would have to be moved closer toward the ring-gear's centerline by adding pinion shims. Conversely, if we had seen a pattern that was closer to the flanks of the marked teeth, shims would have to be adjusted so the pinion is moved away from the ring gear's centerline.