2004 Chevy Tahoe clanking noise

Check the shock absorber dust cover (metal tube top of shock. Also put a dab of grease on metal surface where the steering stop contacts the lower control arm.

Not to sure where the steering stop is. The shock is still the original shocks and the cover seems to be snug and not rattling. The sound is almost like the muffler or the heat gaurd from the headers is rattling, but all seems to be tight. I have no more ideas

One other possibility that comes to mind is Catalytic Converter rattle. If the ceramic Honey comb starts to break apart it will give a rattling noise. Do this procedure with the engine completely cold. This is a must because of the temperature the cat sustains even after an hour, it still could burn you. I wrap a shop rag or towel around my right hand and pick a spot on the catalytic converter. Do not pick amy sharp edges, with the side of your hand strike the housing. Just enough to shake it. Do not use excessive force, we do not want to cause a problem. This is why we do not use a hammer or malet. If this is the rattle you should be able to duplicate the problem. Please use caution when doing this procedure. It should not take much force to rattle the Cat.