The clutch generates briefly (about 500 ms) noises or vibrations/juddering when changing gear.
Note: This entry only applies to vibrations/juddering during the control phase of the converter clutch.
The converter condition can be checked in MVB 007/3 (converter open/ convertercontrol/ converter shut).
Above is extract from a technical service bulletin... I don't think this particular TSB apply to your car as it is newer... but you can see diagnostics can be done without removal of tranny...

Get some diags done on tranny... if you PM an external email I will send you the PDF...