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Hello. Welcome to Just Answer. Please allow me to assist you. Without hearing the noise, it would be very difficult to pinpoint the issue exactly, but, here are a few possibilities that I have encountered that you might want to get looked at:
1) Loose muffler retention
2) rust buildup in the rear brake area
3) Loose brake parts on the rear wheels
4) loose filler panel behind the read bumper
A chain-type noise would most likely be a metal part that is loose, ie the exhaust or a rear brake retaining bolt.