Mine has the same vibrations. In mine if you come to a stop and then fluctuate the brake pedal letting the H3 start moving and then a quick stop it will repeat time and time again. My 2000 Silverado had a steering shaft that kept losing grease and would cause a popping. This vibration I feel is similar yet different. It is almost as if something is vibrating and hitting either the gas/brake pedals or the steering column or both.
When I get a chance this week I plan to go ahead and do an oil change (1500 miles). While I'm under there I'm going to feel around and see if I can find anything loose that may be causing the vibration. If I can't find it I'll be taking mine into the dealer to look at it.
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Traded 4-1-06: 2006 Black Hummer H3 Adventure Series - Vortec 3.5L Inline 5
Offroad Suspension Package, 33" Tires, Electronic Fully Locking Differential, 4.03:1 2-speed Transfer Case, Ebony Cloth Trim, Automatic Transmission, Sunroof, Roof Marker Lamps, Fog Lamps, XM Satellite Radio, CD/MP3 Player, Trailering Package, Black Tube Nerf Bars
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