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thumping/knocking sound from underneath the 240 200 1990

hey all, thought i'd pick your brains on my 1990 240. seems that there is a thumping/knocking sound coming from somewhere underneath the car upon accelerating from a stop and braking to a stop. sounds like its coming from the middle or rear of the car. the frequency of knocks seems to correlate with the speed of the car, although the sound dissapears once i get going around 25mph or so. car otherwise runs great. i gave a general scan of the underside of the car and nothing looked out of the ordinary. any ideas?






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