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I had this happen to me and it turned out to be a transmission pulse sensor.
It's normal for a slight clunk to occur, but not one that makes you feel as if you were rear ended.
BPMSport - BMW Coding / Programming Experts - E60 M5 Euro SMG Available
E60 M5 / E63 M6 Performance Tuning Information Sheet
E60 M5 / E63 M6 Coding Features Sheet: http://www.bpmsport.com/BPMCoding.pdf
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