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The backlash between the ring-and-pinion gears is measured with a dial indicator. The factory specification is 0.008 to 0.015 inch, with 0.012 to 0.015 being the ideal range. Adjustments are made by moving the differential carrier side to side with shims placed between the carrier bearings and the ends of the axletubes. We hit the backlash right on the money at 0.013 inch.