1992 Suburban K1500 under vehicle whine that starts about 10MPH and gets worse

Discussion in 'GM Powertrain' started by clhaggett, Apr 22, 2011.

  1. clhaggett

    clhaggett New Member

    Where to begin... I have replace the front wheel bearings, real axle shafts and bearings, and just rebuilt the transfer case. The reason for the latter was that when I put the truck in 4WHi, the noise stops. This started out very quiet and has continued to get more persistant. Initially you could let up on the gas pedal and it would go quiet. Ready to park this one in a canal, so please help if you have a recommendation. Had the rear end checked and they also checked the pinion bearing.:grrrrrr::grrrrrr:
  2. murdog94

    murdog94 Epic Member 5+ Years 5000 Posts

    Anyone take a look at the front driveshaft U-joints? or the ujoints in general?
  3. clhaggett

    clhaggett New Member

    U joints are all new and cool to the touch after driving.
  4. murdog94

    murdog94 Epic Member 5+ Years 5000 Posts

    Sounds like it could be a bad powersteering pump or a noisy tranny pump... otherwise if everything else has been checked those are really the only other things.
  5. Ethan

    Ethan Rockstar 100 Posts

    Sounds like you didn't put the 2 wheel high part of the transfer case back together right, prolly the bearing for the syncro or whatever it has, if it goes away in 4 wheel high, but is present in 2 wheel drive, then it has something to do with the 2 wheel high part of your transfer case, which should just be direct drive and bypassing the gear that drives your front axles. I would pull it apart and check all your clearances with a fine tooth comb.
  6. clhaggett

    clhaggett New Member

    Took to a second shop and found that the ring and pinion were bad. I've got to admit that this truck is frustrating!
  7. stephan

    stephan Rockstar 4 Years 5000 Posts

    Just curious, how many miles on this truck??
  8. silveradotrailblazer

    silveradotrailblazer Epic Member 5+ Years ROTM Winner 5000 Posts

    X2 what stephan asked.
  9. clhaggett

    clhaggett New Member

    257,000 miles.

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