I've had a chance since my post to do 3 more tests of the new tranny and it is performing brilliantly. With over 15 tests and no failures it is by far outperforming the original tranny. I've also noticed that it does that high rpm shift much smoother than the original tranny did even when it didn't grind.
With over 25 years experience driving manuals I am confident that the error was not my shifting technique. Plus when it did start happening to me I paid close attention to my technique. Never mattered.
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2007 E91 328xi, 6MT
2008 E90 M3, 6MT
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