[bigbuck13]

Had the same problem on a 2001 Durango since it was new. Back to the dealer many times and told.... they all do it turn up the radio and you won't hear it. Replaced gear oil and transmission fluid religiously with short term improvement. At 65,000 miles I noticed play in the drive shaft where it entered the rear end when it was in for tires. $2000 later and a new rear end and the Durango is quiet as a church mouse. Of course now out of warranty.