Hi, hopefully somone can help me out with this. Recently my 8 has been giving me a little bit of trouble. Gears 1-4 are fine but when i shift to 5th gear, the car starts to vibrate from i get near 5k RPMs, and during 6th gear, the car vibrates continuously. I cant find anything on google relating to this. Im hoping its nothing serious but it feels otherwise. It's a 2007 RX8 GT automantic with 44k miles. bought it used.

any feedback is much appreciated.

 

Time for new tires!?

U-joint in driveline?

 

agree with noggin. check those ujoints.