Simply removing the snap ring will free this mode hub and sprocket from the original output shaft. You will not reuse this shaft; a new snap ring is furnished with the Advance Adapters kit. On earlier 231 transfer cases, there is a caged bearing inside the drive sprocket bore. You must press this out so that the original sprocket will fit on the new shaft. TJ and later XJ sprockets (shown) do not use the caged bearing. The drive sprocket fits directly on the new shaft.