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RR Semi-Floating Axle Bearing question

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by GaBnn3, Feb 19, 2006.

  1. GaBnn3

    GaBnn3 Registered Member

    Jan 2, 2005
    Likes Received:
    Holyoke, Ma.
    I'm not a mechanic and have undertaken replacement of the rear axle bearings and brake components, on my '88 Chev V-10 Suburban. During this truck project, I've found mistakes that prior mechanics have left unfixed. In removing the old noisy bearings, I noticed that they were not greased. As a newbie, I'm being careful to do everything right. The Chilton manual says to pack the new bearings with grease. The GM manual refers to the maintenace section, where there is no mention of rear axle bearings, but indicates gear oil in the differential. To grease or not to grease, that is the question. Is there a reason not to? Will the gear oil and grease contaminate each other, or what? This seems like a small issue, but important to me. Thanks.
  2. rick88blaze

    rick88blaze 1/2 ton status

    Jan 24, 2003
    Likes Received:
    Knob Noster, Mo.
    When I replace my rear axle bearings I soak them in gear oil before I install them. That way they aren't running dry when I drive the truck for the first time after installation. The only place I use grease is on the axle seals. :D

  3. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

    Dec 14, 2001
    Likes Received:
    Pleasanton, CA.
    Ton answer your question, the axle bearings recieve their lube from the differential gear oil so you do not want to grease them but however like was said, you don't want them to be run dry the first time they are driven on so make sure you lube them with gear oil prior to re-installing the axles.

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