1987 chevrolet suburban shifting problems

Discussion in 'Wheelers Tech' started by trevor47, Feb 10, 2013.

  1. trevor47

    trevor47 New Member

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    I have a 1987 Chevrolet suburban v10 4wd with a 351, it's been experiencing a problem that seems to be when it goes to shift into a higher gear it's as if it slips into neutral, the revs rise quickly with no gain in speed. Flooring the gas seems to get it to up shift but at that point it is revving way too high. Putting in in 4wd seems to help slightly but does not completely alleviate the problem. Would this be a transmission or transfer case problem and should I replace either? I changed the transmission oil which hadnt been replaced in a long time and the oil that drained out was slightly black.
     
  2. Satanic Mechanic

    Satanic Mechanic New Member

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    Did you change the filter also?
     
  3. woody

    woody eternal noobie Staff Member Media Partner

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    what the heck Chevy has a V10 351??
     
  4. trevor47

    trevor47 New Member

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    The model designation is v10 the engine is the standard 351 v8
     
  5. trevor47

    trevor47 New Member

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    V10 is the model designation, it has the standard 351 v8 and yes the filter had been replaced
     
  6. woody

    woody eternal noobie Staff Member Media Partner

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    350 V8 actually, for that vintage...351 is a Ford motor size :)

    how many miles on it? Original trans? Very likely it needs a rebuild, the trans from that vintage is likely a 700R4 and is not notorious for lasting a long time without needing upgrades.
     
  7. trevor47

    trevor47 New Member

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    It is a 700r4 and it is the original transmission, mileage I'm not sure as the odometer is broken but it's well into the 100,000s if not closing in on 200,000
     
  8. Big Red 88

    Big Red 88 Member

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    I'm a trans rebuilder and to me it sounds like you burned up your 3-4 clutch pack... Extremely common problem with those
     
  9. trevor47

    trevor47 New Member

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    Would that require a rebuild of the whole transmission?
     
  10. Big Red 88

    Big Red 88 Member

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  11. woody

    woody eternal noobie Staff Member Media Partner

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    Yep...you are stuck rebuilding...guessing $6-700 for a shop to do it?
     

  12. VMAN

    VMAN New Member

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    You shouldn't have changed the fluid. All your clutch material was in the old fluid. Time for a rebuild.
     

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