Noticeable vibration felt in vehicle when in "Auto" and "4HI". Problem started right after Nissan dealer changed transmission, transfer case and differential fluids. Nissan dealer says proper fluids were used. I replaced everything from tires, u joints, transfer case. I spent more money than I should have and the problem still existed. Nissan dealer was at a loss. I got rid of vehicle because problem was annoying. I still get emails from Pathfinder forums asking if I ever solved the problem because they are scratching their heads as well.