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Rotate the pinion a full revolution forward and backward to inspect the contact pattern between the ring and pinion, ensuring no binding or excessive gap is present. If the tooth contact between the ring and pinion is showing toe contact (placement near the edges) you'll need to install a thinner trust washer. If the setup is displaying the exact opposite, known as heel contact, then replace the original washer with a thicker unit. After completion, install the lock plates and torque them down to 16 lb-ft before reinstalling the differential case assembly.