With backlash achieved, it's time to check for gear mesh pattern. White marking compound is applied to the ring gear in three different locations, and the pinion is turned to rotate the ring gear, leaving an impression in the marking compound. By reading the guidelines in the instruction manual, you can see if your pattern is acceptable or not, and adjust the pinion shims as necessary. This may take several tries to get it right, but taking the time is worth it. It took us a couple attempts.