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  1. #1
    Sr. Apprentice
    Join Date
    Jun 2009
    Bausman, PA

    Default Loud humming from rear

    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??

    1997 Silverado, Ext cab, 4x4, 5.7, Loaded

  2. #2
    Sr. Engineer
    Join Date
    Dec 2011
    11-22-boogie woogie avenue


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

  3. #3
    Sr. Apprentice
    Join Date
    Jun 2009
    Bausman, PA


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

  4. #4
    Sr. Apprentice cedicol's Avatar
    Join Date
    Feb 2012
    Blog Entries


    That sounds like a bearing or (sinds you have some metal in the fluid) the differential.
    life sucks, but i love it!!!!

  5. #5


    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

    1995 Silverado 4x4
    6" BDS Suspension Lift-3" Body Lift-Add A Leaf in rear -Trailmaster SSV Shocks-Duel Steering Stabilizer Kit -AirAid Cold air intake-
    4.56 Gears with Detroit Auburn Locker-Pro-Comp Traction Bars with duel shocks-Aluminum Skid Plate Kit-38.5" x 16.5" Mickey Thompson Baja Claws-Constant Dropping fuel gauge

    2005 Yukon XL Jet Power Programmer, Bilstein Shocks, Bilstein rear springs, Helwig Anti-sway bars, EGR Window Visors, EGR Hood Shield, Denali Headlights, Headlight harness upgrade, GE NightHawk Bulbs, White Night Rear lighting system, Russell Braided SS brake lines, PowerStop Brake pads, PowerStop cross drilled and Slotted Rotors,
    2002 Silverado ext cab 2wd (Sold)
    2003 Yukon XL (Totaled)

  6. #6


    Sounds like the rear end gears/bearings are worn many miles?
    2011 GMC Sierra HD 2500
    6.0L, Extended Cab, 4x4, 3.73
    2013 Flagstaff "V" Lite, 30', 7300#

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