Ok, I officially declare "Shorbus" a Hummer Guru God, and I humbly bow to him here! He got it immediately!

(Oops, Sorry Shorbus about the last post above, I typod it to death, and now edited it to reflect your seriously H2 Genius status. ) Did not mean to offend, jsut a typo. I meant to say up-posted, not unposted.My mistake. Also,I missed the contact point the first time around. Since the vehicle was never offroaded, and the UCP was not bent, the contact point went unnoticed. [/align][/align]The problem is solved!!!!! I love my Hummer again~!

The big local Hummer Dealer could not figure this problem out. They said there was nothing wrong.

I was starting to hate my rig because it was vibrating me to death. I could feel it in my teeth.

It was in fact the droning from the exhaust, that transfered to the UCP, and then to the rest of the vehicle. Took the UCP off. Just came back from a 60 mile run, and NO MORE vibrating growl NOISE!

I bet every 2007 H2 has this problem, since my exhaust was 1/2" too low in that spot, and that is a lot. I bet they do not have that much tolerance during production.

So off to the dealer torepair this HUGE defect. I would be surprised if there was not a TSB on it.

In fact, does anyone know about a TSB on this that I could take to the dealer?

The other brand new 07 I took for a spin odd the Dealer's lot to compare definitely has the same problem. I am glad I did not give up and assume that there was no problem, and that they all sounded like that.

Thanks to great help from great guys like "Shortbus",weird problems like this get diagnosed and fixed. [/align][/align]And YES, I will suggest to the dealer to shim the UCP and use longer bolts. Since further bending an already pancaked cross-over pipe another 1/2" is just asking for lots of trouble. [/align]
I love my Hummer again~! [/align]

 

i took my ucp off, put a piece of 1/4" plywood under each end of it and drove over it in the bus. bent it enough to keep it off the exhaust, added a couple fender washers at the 3 rear bolts, between the ucp and frame, problem solved without going to the dealer. they won't do anything that's not factory like that, it would be easier to do it yourself.

 

Mine is flat there also.... but my vibration came from the heat shield on the gas tank being broken...

Good job shorty... yet another reason that area needs to be packed with mud...

 

my entire exhaust system is about 1/4" thicker than stock, there's about 1/8" of clay baked on to it - except for the spot that got worn off from rubbing the ucp . . . . . [>:]

 

ceramic caoting... clay coating... same difference....

 

it all comes off when the first layer of rust flakes . . . . . .

 

shortbus, I'm having the same issue it can be felt thru the floor specially on the back seat on the passenger side the only difference is that I have an 07 H3. Please advice.
Respectfully
Jeff