When mine did that, it was a vacuum leak. It shifted hard as hell during that time too, even when the tranny was warm. The fix was the vacuum modulator on top of the valve cover and the fix of a vacuum leak I had at the T's. Search out the pics on that valve cover modulator, put in the new levers, then search out any other vacuum leaks you might have. After getting all that squared away, mine no longer clunks into gear and it shifts as smooth as these cars can get.

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- Brian


1989 500SEL Euro
1966 250SE Cabriolet
1958 BMW Isetta 600