Strange Vibes from entire car

[climo]

I recently purchased my 98 240 about 2 months ago. Everything is fine except for a numbing vibration felt thru the whole car. Idle quality is great so no problems there. Once I rev it to 2k rpms then the car starts to vibrate. You can really feel it thru the steering wheel and inside the car. My rearview mirror shakes until I lower the rpms below 2k. The engine doesn't seem to shake or anything just that you can feel it when leaning against the car.

I checked for items contacting the body but no luck. other than the vibes it runs great. The steering wheel makes my hand go numb after a few hours driving. I also checked the motor mounts and they don't seem to bad. Little movement when power braking.

Idle is smooth, exactly at 2k rpms you can feel the vibe. Above 2k you can still feel it but but not as noticeable. Oh yeah this is in park sitting still. It does have 187k miles but like I said its BONE dry underneath the car.

any ideas?