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1991 Chevy Silverado 1T

Discussion in 'Chevy Trucks' started by kingriver, Sep 22, 2011.

  1. kingriver

    kingriver Senior Member
    from alaska
    Messages: 216

    I could use a little help here in trying to determine the problem
    OK, the truck is a 1991 Chevy Silverado-extended cab-4x4-454 v-8, has a v-box sander mounted in rear, have overload springs installed, airbags installed, timbrens on front if needed and has mount for western uni-mount. Heres the problem, it makes this thud thud sound several times if I get on it hard. A friend said it could be a motor-mount. How would I check to see if that would be the problem ?
  2. Detroitdan

    Detroitdan PlowSite.com Addict
    Messages: 1,937

    I would try prying on it with a big wrecking bar with a hook on the end. see how much movement you've got. And obviously look for missing bolts. Another thing to check is the transmission mount. Seen those fail, hard to tell because they sit on top of the mount and it looks fine, but whe you wrap up the drivetrain it pulls the bolts up through the rubber. Hold the brake and have someone watching while you rev it up.