Problems with the rear axle Stinger 2.0T

Hello all, I have mentioned as in one of my threads problems with the track/road position at speeds from about 180 km/h upwards. Yesterday I discussed the topic with the uncle of my wife who runs a free workshop. He meant there is the rule that one can assume that all problems that occur over 100 km/h come from the rear axle. I mean here in the one or other thread to have read that with some polter noises from the hi Nteraxes have occurred. Are there any other problems with the rear axle known? Bzw. who can report how the polter noise problem has been eliminated? In advance Thank you! LG Eagle1982