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Best to start at the beginning of the thread that my link points to. The link was my explanation of how the 5 ton transfer case works. What you are experiencing is the reverse sprag being engaged instead of the forward sprag while moving forward. The axles are winding up so tightly that they...

http://www.steelsoldiers.com/showthread.php?1093-Sprag-substitutes&p=843655&highlight=#post843655

Sounds like the sprags in the transfer case to me. There are air valves on the trans shifter that operate a 2 way air cylinder on the transfer case. The cylinder has to be fully in one position or the other to engage the forward or reverse sprag. When the trans is in neutral or forward gear...