Kirwin said:This is not as uncommon as you might think. New Venture Gear (NVG) (formerly New Process Gear) used a type of split "snap ring" to hold the main shaft in place. If this "snap ring" breaks this allows the main shaft to slide forward and will engage the clutches and partially engage four wheel drive. This motion will quiclky wear items in the case that are not supposed to be engaging/disengaging as often as is now occuring. There is an after market fix for the snap ring issue with a tougher keeper for the axial movement however the main shaft is replaced by one with a larger machined slot to accept the lager "snap ring". The New Venture Gear NV 241 D is the orignial transfer case. With a 241 HD being a direct replacement as far as I can determine. The D in 241 D stands for Dodge as I understand but there may be other models that will also bolt up. I do have a few contacts at NVG if you need technical information to assist your search. Let me know. Hope this helps Ken Irwin