Shifter Vibration

I've noticed (or I should say I forgot) that my car makes a hideous buzz in higher RPM through the shifter. What are some common causes for this?
 
It used to be really sloppy and vibrat-y and  I replaced the shifter bushings with brass insert type ones. The vibration noise stayed the same. The sloppiness went away but the BUZZZZZZZZZZZZZZZZZZZZZZZZ remains.
 
Any help is appreciated before I pull the interior apart.
 
Kind Regards
Senol