I had shake and shudder on and off for over two years just random times. Changed the axle and bearing and all is well.

The inner joint is designed to telescope but not the outer joint however after seeing the inside of the inner joint it would be very easy to expect that to be the cause.

More interesting in your case and you will like this: recall how i the outer joint had six balls so that worked out pretty well with the 3x wheel speed and would mean a harmonic?

The inner joint has THREE wheels and would mean you should get 3x wheel speed for your vibration.

I would say nearly 100% certain you found the source.

There was a small error in perfection as I think there math worked to like 2.7-2.8x per tire revolution but I think I may have forgotten to subtract the 3mph from the speedometer.

2.8/0.96=2.917 that's even closer!

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)