Noises are funny and can sometimes transmit from front to rear. If you eliminated things like brake pads hitting and flex shafts. Is it possible to have someone drive and lay on the floor to try and isolate where??

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Ricali

03 C240 4matic wagon
95 300E 234,000
7 prior 240;s 5 still going
81 300sd gone
65 230sl gone
49 Studebaker Champion
90BMW convert.167,000
60 Dodge D-100