Mine does the same thing. Shakes like a dog poopin peach seeds!! It even broke of at around 30k! Ur shifter is actually two pieces. They are joined by a thin piece of metal bent in a half moon around the two parts and welded. Well at 30k miles the crappy welds broke on mine!!
It was a nightmare shifting without the shifter coming up! No leverage at all. My guy at local dealership fixed me up though! They ordered me all new parts, covered under warranty, and even went as far as re-welding the original pieces back together until the new parts came in!!
Have not had any more problems since! But it still does it's dance on rough roads!