I have a 2000 silverado 4wd. I was getting a humming noise from what sounds like the front end (hard to tell). I can hear it best when on the highway at about 65mph. I notice it more when i let off the gas, although I think it still remains while giving it gas. The noise does not go away when I swerve from side to side. Find the latest breaking news and information on the top stories, weather, business, entertainment, politics, and more. For in-depth coverage, CNN provides special reports, video, audio, photo galleries, and interactive guides.