Loud humming from rear

Discussion in 'Chevy Silverado Forum (GMC Sierra)' started by kjb13, Mar 12, 2012.

  1. kjb13

    kjb13 Member

    I have a '97 Silverado 4wd with a 10 bolt rear in it. There is a loud humming noise coming from the rear. I drained and refilled with Mobil 1, hoping maybe my oil had seen better days. No help. Anyone have any ideas on waht might be the problem??

  2. dipstick

    dipstick Member 2 Years 100 Posts

    Could be wheel bearings ..did you see any metal in fluid.
  3. kjb13

    kjb13 Member

    Very, very fine, but nothing that I thought was alarming. Any way to check without pulling the axles??
  4. cedicol

    cedicol Member

    That sounds like a bearing or (sinds you have some metal in the fluid) the differential.
  5. Pikey

    Pikey Moderator Staff Member 5+ Years ROTM Winner 5000 Posts

    How do your u joints look? A good rear end shop should test drive it and diagnose it for free. I don't do diffs so if I ever hear something I just take it to the guy up the street. He never has an issue checking it out. Last time I thought it was and axle shaft bearing, I went in. He drove it, brought it back jacked it up and attempted to move the rear wheels up and down, left and right. Said all was good and sent me on my way
  6. zogg

    zogg New Member

    Sounds like the rear end gears/bearings are worn out....how many miles?

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