Pinion Depth Variance

Fig 1: Pinion Gear Face Etchings

Courtesy of CHRYSLER LLC

Ring gear and pinion are not supplied as matched sets. A plus (+) number, minus (-) number or zero (0) is on each gear. The pinion depth variance (1) is the amount the depth varies from the standard depth setting of a pinion marked with a zero. The standard depth provides the best gear tooth contact pattern. In the graphic, the number -05 means to subtract 0.05 mm (0.002 in.) from the calculated shim to adjust for the pinion variance.

Fig 2: Pinion Depth Shim & Collapsible Washer

Courtesy of CHRYSLER LLC

Compensation for pinion depth variance is achieved with select shims. The shims (3) are sandwiched between the pinion head bearing cup and axle housing.

If installing a new gear, note the depth variance number of the original and replacement pinion. Add or subtract this number from the original depth shim to compensate for the difference in the depth variances. The numbers represent deviation from the standard in hundredths of a millimeter. If the number is negative, subtract that value to the required thickness of the depth shims. If the number is positive, add that value from the thickness of the depth shim.