popping noise from frame rails

[DROPER]

I have had this problem on my GM truck too. It sounds like the cat or muffler cooling down and the metal pops back. I never got my truck fixed (even though it was in warranty) but it was darn annoying.

I plan to add it to my list.

[OLE YLLR]

COULD IT BE THE CATALYTIC CONVERTER COOLING DOWN.

[HappyJack]

Mine does this too. It is really loud! I am going to get the parts and try to fix it myself.

Cheers

[ formerly known as wannabe and wannabeinit ]

[Texas Red]

I would say if dealer doesn't acknowledge or work in accordance with service bulletin, you should tell general manager you will be calling Hummer Customer Service.

Jim
Red H2