Hello everyone. I have problem with my 300c 2004 3.5 , problem with the transmission. it started with a jerk when shifting from first gear to second. when holding around 1800rpm, the car gets vibrations. sometimes the gearbox gives too little revs when reducing gear and it gets around 500rpm and the car goes out. my mechanic took off the transmission to change the oil and found a piece of ? spring? at the bottom. did anyone have a similar problem? is it a torque converter or maybe something else?