David,
I haven't been able to narrow it down. I can go over a bump go back and go over it again and it will do it the first time but not the second. You described exactly what I hear/feel but it doesn't do it consistently in any driving situation except for bumps. It is like if the front end gets light from coming off a bump is when it does it the most, but I can't be sure of that. The tech jacked it up this weekend at a Hummer Happening and he could find anything loose or noticably bumping.
Other than the noise/feel you don't notice it. There is no pulling, no unlevel stance, steering is the same, etc.
I'll post here as soon as I know more so you can tell you dealer what to look for.
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