Vibration, Not mechanical

[raggadie]

I have a noise coming from the truck when driving. It is not all the time. The engine and the transmission is new. Therefore, I rule these out because it is not all the time.

What are some suggestions to look for being I can't see this when parked in the drive way. I am sure that these ford rangers have common issues.

What is most likely to look for, and then what is next?

Thanks for your replies,
Ross Wood

 

[BRUTUS_T_HOG]

U-joints? Tires? I'm assuming this vibration is speed related.

 

[adsm08]

I am not sure how to respond here. A vibration is almost always the result of something spinning with it's center of rotation not being the center of mass, thus making a vibration, by definition, mechanical.