Vibration between 1500-2500rpm

[Photoguy_15]

My '02 Olds has developed a very noticeable vibration at part throttle from about 1500-2500rpm in 3rd and 4th.

The truck has about 270,000 km on the clock.

I've searched on Google, and haven't been able to find anything. Other than it maybe being the torque converter.

 

[Sir ffeJ]

Need more info. Where area of the vehicle does it sounds like it's coming from?
Stab in the dark it, could be a motor mount.

 

[Photoguy_15]

Figured it out. The rear u-joint was obliterated.