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Gear Heads - Need Help...

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by rem7600, Jul 25, 2002.

  1. rem7600

    rem7600 1/2 ton status

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    Location:
    Coeur d\'Alene, Idaho
    1977 GMC 3/4ton
    not stock 305, TH400, recently replaced far
    rear U Joint, 14 Bolt factory rear with locking diff

    Clunking sound when loaded

    It seems to happen when going around a right
    hand turn under load on washboard (typically uphill)

    Does not do the same on left hand turns. Does not
    do it even on hard turns on the pavement left or right.

    From Passengers side feels like a cab mount but
    mounts look good.

    Any thoughts? Hoping for a variety of answers so I
    can check as much as possible.

    Thanks

    REM7600
     
  2. Leadfoot

    Leadfoot 1/2 ton status Premium Member

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    Could be lots of things, but I would check your sway bar and mounts, check your steering arm to see that it is not contacting the tube on the axle (sign of worn balljoints), sheetmetal popping, body mounts (all), shock mounts, and area around steering box (known for cracking).
     
  3. m j

    m j 1/2 ton status

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    titghten u bolts or look for spring movement, it can be loud
     
  4. Blue85

    Blue85 Troll Premium Member

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    Avoid right hand turns on uphill washboard roads?

    Check the engine and tranny mounts, look for wear in all 12 of the spring/shackle bushings and check the U-bolts. You might also pull on the exhaust to see if it might move and hit something, especially if the enging moves a little.
     
  5. rem7600

    rem7600 1/2 ton status

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    I'll simply stick to the tar from now on Blue85! :-)

    Thanks for your reply!

    REM7600
     
  6. rem7600

    rem7600 1/2 ton status

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    Thanks for the responses... Doesn't sound REAR END like to me which was my biggest fear. The 305 doesn't stress it anymore but I'm afraid the oringinal 454 in the truck MAY have. I bought "x-hand"... Been a good truck regardless and will check all that people responded with.

    I had a similar issue with my 89 Jimmy and it turned out to be U bolts loose and stripped... Perhaps I should really consider checking into it and leaf spring further...

    REM7600
     

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