Sorry if this is a repost but I have been searching for 2 days and have not found anything like this. I own a 2008 Jeep Commander 4.7L two weeks ago it began to make this low humming noise which I thought nothing of. Then 3 days later it started making this noise that sounds like road noise from an off road tire. I have found that the noise is coming from the rear left side but I'm not sure what it is any ideas. Also this is my first 4 wheel drive vehicle.