What years of GM Trucks had this rubbing problem. Also what modifications did they do to internal parts to cause this. Is this problem with automatic transmissions or manual transmissions. Any body know where to look for an exploded view of the internal parts of a transfer case. Lots of questions. Just curious. Thanks

http://new.photos.yahoo.com/div4gold/photo/294928804205175620/1

Nr. 31 is the pump. The problem is in the NP263 and NP261 transfer cases. No modifications cause the problem but Dmaxzillatech's pump modification fixes it.