Bad vibration believed to be from the rear when over 70 but it's not constant it will go away randomly. Not sure what to look for. Also with this tireservation were new in march and the right rear is worn significantlt like it has 40 or 50 k on it but has about 15 to 20 k on it ot has had 2 4 wheel alignments done. First one when tired went on and another a few months later after a front strut blew a seal and a steering rack replacement. Can't put my finger on what causes it to come and go but it's not a vcm cob because it stays if I put transmission in neutral.