2700rpm vibration

[BigSix]

We all know about the 2100rpm buzz in the steering wheel and the TSB to isolate this normal engine vibration from the cab with weights on the hydro-boost hoses. I'm not planning on having the TSB done as the buzz doesn't bother me.
What does bug me is a heavier low frequency vibration almost like the torque converter or a tire is out of balance at 2700rpm. Mechanic at dealer said they all do it. I don't remember if my last three did it or not as they were so noisy I tried to avoid high rpm. It does it sitting still in Park or Neutral or with O/D locked out running down the road. Just curious if yours also have this vibration. I keep thinking I want to take another one for a test drive to compare but haven't had time yet. It could very well be normal (Dodge makes it, Cummins shakes it) but I want to be sure...

 

[hoot]

Mine does it

 

[BigSix]

I forgot about this post. I hope this doesn't mean there are only two trucks out of all the 3rd gen members with this vibration.
I had the hose weight installed along with a reflash for the tranny and O/D power. The weight makes a difference all through the rpm range but most noticeable at 2100rpm. If a damper of some form would take care of the 2700rpm vibration, I'd be first in line...