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Clunking Noise

Discussion in 'GM Powertrain' started by 4dafunofit, Oct 20, 2010.

  1. 4dafunofit

    4dafunofit New Member

    Hey everybody lookin for some advice. When I am coasting down the road and re apply pressure to the accelerator I Hear a clunk, almost as if there is play some where. I was thinking this may be my U joints but im not sure. Any ideas?

  2. ippielb

    ippielb Epic Member 5+ Years ROTM Winner 1000 Posts

    Easy way to tell if it's your U joints, go under your truck, grab your drive shaft and go to town, if there is any give. replace them. If no give, take a big screw driver and wedge it in there and see if there is any give, front and rear U-joints. They're only $20, better be safe then sorry, its worth the $80, instead of the $200 tow to the shop because you bust a U-joint in the middle of the street.
  3. stephan

    stephan Rockstar 4 Years 5000 Posts

    Ditto to what Ippielb said, & while you're under there be sure and check the rear trans mount. They are known for coming loose and clunking every time you get on, or off the gas.
  4. 4dafunofit

    4dafunofit New Member

    I did check for with just my hands and there was no give , but I will try with the scewdriver. Will also check the trans mount. Thanks for the help
  5. murdog94

    murdog94 Epic Member 5+ Years 5000 Posts

    Year make, and model will help a bit as well since some years the backlash on the rear differential gears was higher than others so it would allow for a clunk like you are describing.
  6. 4dafunofit

    4dafunofit New Member

    Its a 2004 Z71 Chevy Silverado 72,000 miles 5.3

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