My dealer called me tuesday night to advise me that they were ordering the parts to replace the rear differential for my 2006 OR. As I have stated above I have not really taken my vehicle off road. I have used 4 wheel drive several about 4 times on pretty poor dirt roads. The one thing I have done out of the ordinary is that I tow a camp trailer. The dry weight is 3840 lbs so it is well below the tow capacity of my X.