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black fluid

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by MA87K5, Jan 5, 2004.

  1. MA87K5

    MA87K5 1/2 ton status

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    I have a 12 bolt rear with an eaton posi in it. when I checked the rear the fluid was black. No flakes of metal at all. I put in posi additive and 80w90 gear oil. Why would the fluid be black? Thanks
     
  2. pauly383

    pauly383 Daddy383 Staff Member Moderator

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    The fluid is probably just old. I just got a 12 bolt with dark fluid too. Just change it and your seals while your at it. /forums/images/graemlins/k5.gif
     
  3. MA87K5

    MA87K5 1/2 ton status

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    The fluid was put in new with the new eaton in 2003 over the summer.
     
  4. Pookster

    Pookster 1/2 ton status

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    You sure it was black? I know different manufacturer's sometimes have different colors- I know when my rear end got refilled, the lube my mechanic used was dark blue. When i changed it, mine was like motor oil colored with a tad of green hint.
     
  5. Confedneck

    Confedneck 3/4 ton status

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    gear oil mixing with LS additives can cause fluid discoloration, try an experiment in a plastic bottle and mix a little of each..see what happens.. /forums/images/graemlins/thumb.gif
     
  6. MA87K5

    MA87K5 1/2 ton status

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    it still smelt like gear lube, not burnt. Hopefully it is the mixing of the two fluids. Thanks.
     

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