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Thread: 4wd clunk

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    Legend bry2500's Avatar
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    Default 4wd clunk

    Each time I drive in 4wd i hear a loud clunk, mostly during slow tight turning but also sometimes just when starting to move straight ahead.almost sounds like a u joint but super loud. I have checked every thin out and all seams tight and not worn. I know whata cv joint sounds like when it's going and this definitely is not a cv joint. I has almost a ping noise to it like if you were to push a dent out of sheet metal. Any thoughts?

    also it is mostly when driving in reverse and turning.
    BRYAN

    "IF YOU DON'T TREAT IT LIKE A TRUCK IT'S JUST A REALLY BIG CAR"

    02' Avalanche 2500 Onyx Black
    8.1L Vortec
    43,000 miles

  2. #2

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    4wd's don't like to turn tight when in 4wd, especially on dry pavement. A clunk in those situations is normal, but try to avoid them because it will damage the transfer case. The noise you hear when just starting out could be a little play in the transfer case. Someone else can probably help you some more.
    Gary

    99 K 1500 Suburban
    78 Silverado Big 10 w/factory 454
    00 S-10 Blazer
    1976 Trans Am
    1980 Honda CB900 Custom

  3. #3

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    Sounds like the 4wd binding up and releasing. Normal in 4H/4L on a good traction surface, though it does indicate that something will likely break if you continue the practice. 4H/4L should only be used when traction is poor enough to allow the wheels to slip.

    I had a truck do something similar when I had mis matched tires (same size but different manufacturer). The size difference between manufacturers was enough to cause the drivetrain to bind up and release with a clunk.
    '98 K1500 Suburban LS 5.7 L 4L60E NV246 ARB
    '92 Ford Explorer XLT 4x4 4.0 L A4LD BW13-54 Trac-loc rear
    "My toys were the greasy cogs and springs and pistons that lay around all over the place, and these, I can promise you, were far more fun to play with than most of the plastic rubbish children are given nowadays." Danny in Roald Dahl's Danny The Champion of the World

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    Legend bry2500's Avatar
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    Quote Originally Posted by MrShorty View Post
    Sounds like the 4wd binding up and releasing. Normal in 4H/4L on a good traction surface, though it does indicate that something will likely break if you continue the practice. 4H/4L should only be used when traction is poor enough to allow the wheels to slip.

    I had a truck do something similar when I had mis matched tires (same size but different manufacturer). The size difference between manufacturers was enough to cause the drivetrain to bind up and release with a clunk.

    I do have different manufacturer tires, they are the same size but the rear look a smidge smaller. I thought it was an optical illusion because of the front end rake on the avalanche. Looks like I have to find 4 new tires. Thanks for the quick replies guys.

    BRYAN

    "IF YOU DON'T TREAT IT LIKE A TRUCK IT'S JUST A REALLY BIG CAR"

    02' Avalanche 2500 Onyx Black
    8.1L Vortec
    43,000 miles

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