99 5.9L

1999 Dodge Durango

Hi l have a durango with 198K l noticed a loud hummm coming from the back of my truck when l go over 80km
also it starts to viberate when l let go of the gas it goes away l did a little test l went down hill at 120km let go of the gas nothing no noise at all no vibe can you please help me thank you
September 30, 2007.

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