hey BR this will happen to you as well if you tow your V21 much. the load when breaking will break the factory c-clip on these transfer cases and then they grind lightly when driving in 2 by only but will bind in 4 by and destroy the transfer case so if and when it happens you can drive it with by removing the front drive shaft and then drive in 4 by with no problems, mine broke at the coast and i got it home no problems by taking the front drive out and then locked in4 by and came home. this is the best fix or fix now before it breaks.
http://www.drivetrain.com/gillies/Tcasesaver.html