See if you can determine what frequency the clunking noise is at. If it happens once per wheel revolution, then it is likely a ring gear issue. If it happens once per drive shaft rev, then it may be u-joint or pinion gear related.

I had a similar issue in my VW and finally determined it was a once-per-wheel-rev clunk and as it turned out it was a bad ring gear in the transaxle.

r.c.brown@ieee.org
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