I’ve replaced the bushing in the shifter with a brass bushing to get rid of slop, I noticed that if I’m in high RPM, 4-5k in 3rd, there’s quite a lot of vibration coming from the shifter itself, could this be due to the brass bushing? Or should I be inspecting the mount for play?    im trying to reduce the vibrations coming from the car, perhaps my engine mounts should be inspected as well. I switched over to an RT diff mount and it made quite a lot of difference in the rear end.