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I have a similar noise that you describe. I traced it to that rubber block isolator that is on the driver side rear section of the frame. Its mounted on the top side of the frame between the frame and bed. The rubber will hit the frame over bumps causing a squeak. Might look into that on yours
Is that the cast iron block that is mounted in rubber bushings, I have called it a damper in the past?
If you have a tailgate step, check that. Mines always making noises!
Do you mean the factory bumper? the plastic on the bumper where you step? thanks...joe