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On the 2001-2007 GM transfer cases, models 136,146, 246, 261, 261HD, 263HD, and 261XHD all come with a magnesium rear cover which are prone to leaking. The pump housing is driven by the shaft and wears out the soft magnesium rear cover by wearing a hole, as shown below.
The DmaxStore Transfer Case Upgrade Kit will alleviate this very problem by including a billet transfer case pump housing that is designed to distribute the force over a much larger patch than the OEM pump housing does. This will eliminate any worry of the pump housing wearing a hole in your transfer case. Here is the DmaxStore Billet Transfer Case Pump Housing.
The DmaxStore Transfer Case Upgrade Kit will alleviate this very problem by including a billet transfer case pump housing that is designed to distribute the force over a much larger patch than the OEM pump housing does. This will eliminate any worry of the pump housing wearing a hole in your transfer case. Here is the DmaxStore Billet Transfer Case Pump Housing.