I have a 2001 Durango. Bought it new, currently has about 61K on it. It is a 4x4 4.7L auto trans, 3 range electro shift trans fer case. Started yesterday wife was in town called me saying the thing was making grinding noise especially when going thru holes or over rough uneven pavement. Got home tried it out and it is a very prnounced noise but it is a loud snaping noise lik something is slipping and catching when you are moving. speed or 4WD setting does not seem to change it much. It is eneven and sporatic but never stops. You can actually feel a lurch or catch & snap phyiscally as well as audible. Thought it might be a ball joint or CV but they seem to be ok. Jacked up off all fours and put in drive but it will not do it then only when trying to move vehicle. Buddy tells me that there is alot of transfer case problems with these. I do not know but I am looking for help and direction.