Just bought 2019 Gt63s with 40k miles.

When take off I feel strange shift like jerking/shuddering also when stopping I get very hard downshift even in C. Not sure if that’s normal?


lastly which is not normal is that when I activate the drift mode and taking a u turn I hear very hard grinding noise from the back and car is hesitate to move. Once I drive straight everything is normal. Again that’s only on rear wheel drive during u turns only. Any idea what that could be?