I've got the creaking and a popping sound.
there is a TSB for the popping sound...elongate the cross member bolt holes on the driver's side. I thought this was odd until I removed the cross member...the passenger side bolt holes are elongated from the factory. Anyways, I did the work, and I was creak/pop free for 2 weeks...it started again tonight. I think GM has a bit of design problem with the cross member...it looks to me that the bolting securing the cross member is not sufficient to keep the cross member and frame tied together without movement.
Any suggestions on this one are appreciated!
Also, if you do isolate the skid plate with rubber washers, on the back mounting points, you'll probably need two washers...cross member/washer/front bracket for 'tube protection'/washer/skid plate. The front bracket of the 'tube protection' is sandwiched betwen the frame and skid plate.
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