Hi everybody I constantly read these forums but figured I’d join them now. Anyways I have a 2002 suburban with the 5.3 and am having some strange chirping in the rear. This noise used to be once in a blue moon but now it is all the time. Definitely the rear due to the speed bumps in my neighborhood making it obvious. I have taken the upper and lower trailing arms and track bar off to inspect bushing and apply a a little silicone spray to see if it would go away so I would know to just replace bushings. That came to no avail. About 10k miles ago I replaced calipers, pads, rotors and greased up all applicable places so I know that not an issue especially since the noise is not altered by brake application. Universal joints are factory but are tight as can be and have no obvious play or noise. I found nothing strange after removing rotors to look at the rusty components of what left of my parking brake. I’m starting to get lost lol no shop has told me anything but just keeping driving it. You can’t really feel the chirp while driving like no vibrations or anything of that matter but man this noise has gotten pretty nasty. I don’t pour tons of money into the vehicle since it has 318k on the odometer but it runs like a champ with no issues in the motor or transmission. Give me some thoughts or pointer to look at. Also it has a strange crunchy noise almost like running over plastic when moving slowly. Can’t figure it out!!