I have a 2006 4.7 Commander with approx 15,000 miles on it. It has a gear whine in it which is loudest at about 68 mph. You don't hear it below about 40 mph and it becomes less loud, although still present, above 72 or so. It is only present when there is a load on the power train. Let off the gas and it goes away. It was not present when the vehicle was new and has become louder in the last 5000 miles or so. It seems to be downstream of the transmission because the noise does not change if the transmission downshifts. I suspect it is coming from the transfer case or one of the differentials, although it does not seem to be coming from the front of the vehicle. My dealer tells me that it is normal for a Commander. I don't think so or there would be more about it on this forum. Anybody else have this problem or have any ideas about a solution? Except for this problem, the vehicle is great and I really don't want to get rid of it. But the noise is really annoying. Thanks for your help.