My avalanche has this annoying rattle. Now i know its 17 years old, but i'm trying to sort it out. Its not exhaust. It never rattles with weight in the bed, and it never does when i have my travel trailer hooked up ( weight distributing hitch). The front and rear sway bar end links and mount bushings have been replaced. Its toward the rear.
This truck has independent rear suspension. I have replaced the left to right track bar.
I'm currently replacing the parking brake shoes and the rear brake dust shields that have rusted away. I can't reproduce the rattle by shaking the upper and lower control arms. Its not the spare tire.
But should i just replace them? There is an upper and lower rear arm on each side.
What would cause and unloaded rattle?