Problem just showed up after getting of the highway. Car vibrates heavily at idle in drive, you can see the hood shaking and various things in my interior rattle. If I take the car out of drive it still vibrates visibly but not as harsh as in drive.
When the car is moving, and also when I took the car back on the highway today, I noticed that there is still a perceptible vibration and it becomes a steady hum (not audible just something felt through the car).
I checked the engine mounts and they are still 1.5 inches tall, they were replaced about a year and a half ago.

Can the transmission mount cause this kind of chassis vibration? Or should i be looking somewhere else? Maybe another mount somewhere?
Just looking for thoughts and experiences....thanks