NOISE 2002 GMC ENVOY, AUTO TRANS, 4L 6CYL

  • Tiny
  • mhadams
  • 2002 GMC Envoy
  • 6 CYL
  • 4WD
  • automatic
  • 120,000 miles

When at a standing idle or in park, I've begun to hear a sound like aluminum sheets vibrating against each other coming from underneath (most noticeable when in garage). Noise is not present all the time. If I depress the brake and then release quickly while in park, the vibration becomes louder for a brief moment. Checked trans fluid - OK. Have checked for loose hanger on exhaust. No problem there. Thoughts?

Monday, June 13th, 2011 AT 6:09 PM

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