Truck Minor Vibration over 70 MPH?

The reason I suggested driveline is the way he described it, when going from acceleration or even steady to coasting, it is not uncommon at all for it to vibrate for a second or two if yhere is some slop, especially in the slip joints. Most balance problems last longer than a few seconds and goes more by changing the speed.
In other words, it will vibrate from 65 to 70 just for example then quit if it is a balance or tire type deal.

 

I agree, too low of a ride height will have a grinding noise when letting off the accelerator. Too high of a height, and binding, popping and or grinding when accelerating. I had a 92 WS that rode terrible,I experimented a lot with the height, used to adjust it sometimes, depending on the weight of Load, I was studying Volvo’s and Airliner suspensions, Never could get it to ride good.Finally gave up,Bought a Classic, they ride good, as long as height is set perfect. A little off wreaks havoc, rough ride and vibrations