NOISE , AUTO TRANS, 4L 6CYL

2002 GMC Envoy

Tiny

mhadams

June, 13, 2011 AT 6:09 PM

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?

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