This noise problem has been going on for far too long. The Crown dealership in Holland mi attempted to repair this but even after replacing the transfer case the problem still is going on. I paid to replace rotors and pads on there suggestion but that didn't help either. I made two separate complaints directly to Chrysler and I am still waiting on word from last complaint.I wish Crown chrysler would commit themselves to fixing my jeep. After buying three new vehicles in my lifetime the Jeep wrangler has been the worst for major breakdowns.