Need advice vibration

Here's a similar recent thread that has many tips for troubleshooting.

Truck Hopping After New Drive Tires

I'll add,, a "high frequency" vibration is usually less indicative of tire problems,
and more indicates other things in the driveline such as u-joints, driveshaft, and carrier bearings (if any).
I'm not saying it isn't in the tires being out of round or out of balance, it's just less likely in "high frequency" vibrations.

 

I've been this route and it can be so many things you'll pay a fortune trying to solve it. Most everyone will just want you to throw money at the problem replacing this and that until they fix it.

Wheel bearings
Shocks
Ride height
Wheels
Tires
Drive shaft out of balance
U-Joints
Worn out rubber bearings

And so on

 

Most tires with a U.S. logo are made in China!

 

Check the U-Joints, and especailly the slip yoke driveline. Many forget to grease that. They always grease the U-joints but forget the Slip shaft. Everytime when Im asking personally to the symptoms you desrcibe, its always what I just mentioned.

 

There was a problem with Volvo air suspension leveling system, you should check this valves on the drive axles.

 

Easiest way to find out if it's drive line or chassis is to take the axle shafts out and run the drivetrain up to where the vibration occurs. Easiest and quickest way to know if it's chassis or driveline.

 

That's a very interesting idea. I've never heard of that. Have you actually done this? Would you get oil flying out past the bearings when you've got it rotating at high speeds?