I have a 2006 crew cab short bed Duramax truck.

While having truck in park or in neutral and accelerating through RPM range from idle to 5000 RPM truck has a distinct vibration from 1200 to 1500 RPM. Vibration is not evident at any other RPM.

This vibration is also evident while driving in any gear at any speed that falls within the 1200 to 1500 RPM.

I have been chasing this vibration issue since the truck had 100K and it now has 190K. I initially believed it was a driveline problem and I have change EVERY rotating part aft of the transmission including transfer case, drive shaft, rear differential and bearings and the front wheel bearings. With no improvement with that "particular" vibration.

I have an evolution programmer on the truck but have disconnected it and the problem still exists.


Truck runs and performs fantastic.

Anyone have a cure for this engine vibration between 1200 and 1500 RPM while truck is in park or neutral?

Thanks in advance