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The front output shaft seal on many NP transfer cases, GM part number 12474947, is a two piece design which requires driving the outer flange and the inner sleeve at the same time. This tool from Merchant Automotive does the work of the OE Kent Moore tool J-43484 and is less expensive than it or any other option I've found. It is made of solid metal assuming aluminum and has a center hole if you want to attach a driver handle, though it works fine on its own.