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'87 blazer noise

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by mattyblazer, Sep 27, 2002.

  1. mattyblazer

    mattyblazer 1/2 ton status

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    \'87 blazer noise

    Can someone tell me what the thumping noise that comes from under the floor near the t-case is, and how to stop it.
    If I gas the truck hard from a stop I get a rapid thump, thump, thump through the floor.

    Thanks
    Matt
     
  2. Bubba Ray Boudreaux

    Bubba Ray Boudreaux 1 ton status

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    Re: \'87 blazer noise

    U-joint?
     
  3. mattyblazer

    mattyblazer 1/2 ton status

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    Re: \'87 blazer noise

    I got new u-joints, transmission + mounts, t-case mounts, and the shafts were just balanced.

    But Thanks
    Matt
     
  4. Ck1500

    Ck1500 1/2 ton status

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    Re: \'87 blazer noise

    how about axle wrap??? like the springs might be unloading when your giving it gas!!! ??? just a guess

    Ck1500
     
  5. Cmoe

    Cmoe 1/2 ton status

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    Re: \'87 blazer noise

    What kink of trany mount did you get? rubber or Poly? Sounds like eather the old body mounts are bad and the new trans mount makes the t-case shifter or t-case to hit the floor board.

    Also check the exhause for excessive movement. The mounts sometimes get destroid and then it bangs on the udner carage.
     
  6. mattyblazer

    mattyblazer 1/2 ton status

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    Re: \'87 blazer noise

    I put rubber transmission mounts in, and thanks guys I will look at your suggestions.

    Matt
     

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