Pinion Depth Variance
Identifying numbers for the ring gear and pinion are marked on the pinion (1). A plus (+) number, minus (-) number or zero (0). The pinion depth variance/deviation (1) is the amount the depth varies from the standard depth setting of a pinion marked with a (0). The standard depth provides the best gear tooth contact pattern.
The pinion depth is set by selecting the shim (1) that fits between the pinion housing and the axle housing.