Cab vibrates at 80mph plus

[Jerry@tx]

Does anyone know why my cab vibrates at 75plus mph? It stops when you go below 75.

[Jerry@tx]

02 f350 superduty, drw 8' bed.

[SuperCrutyPS]

So don't drive 75!!!

- Seriously - what kind of vibration is it? Like a hum or more clunky? If like a hum, you could be at the beginning of your U-joints going out. I've had that hum before and that's what it was. If clunky, your guess is as good as mine.

[Jerry@tx]

hum, found out my u-joints were going out. it was making a whining noise while driving. hopefully this will fix the problem

[mgassel]

if the u joints are out while you are there replace the carrier bearing.