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whining from rear diff

  1. 2007 Rear diff whine (2.2 L diesel)

    4.3 Mechanical
    Sadly my baby developed a nasty whining sound. I put vehicle on stands and ran it in 3rd gear. Using mechanics stethoscope noise was not on wheel bearings. Noise from differential aluminium housing is very loud. Any guidance would be appreciated. Basic procedure, any drawings and settings etc...
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