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Proper ring-and-pinion life begins with establishing the correct gear pattern. Identifying the wear pattern will signal if the backlash between the ring-and-pinion needs to be adjusted by swapping out different carrier shims. To do this, Rodriguez applied gear-marking compound onto the ring gear to identify the wear pattern. Spinning the gears produced a wear pattern that illustrated a majority of the gear contact was in the center of each tooth—exactly where it needed to be. Contact at the corners or edges of the teeth could break them and the backlash would have to be readjusted.