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OK this is a long shot but i will give it a try

in the year or so i have owned the vehicle i heard a very loud strange sound 3 or 4 times
kind of sounded like something metal sliding against something metal and then a clang at the end
first time i thought it may have been something metal loose in the rear area but i found nothing


happened i think 2 more times
most recently today
was loud and definitely ended with big clang
started me to say the last
its a long shot but i thought id ask. extremely puzzling
i thought maybe a sound from the radio but no definitely seems like a metal sound from the car. form behind me perhaps...
and i cant say when it happened i went over a big bump or anything. just on the highway