Vibration from where?

[the sad]

Hey, I have an 00 F350. I have a vibration problem. It starts to happen around 40 mph when accelerating or constant throttle. It stops when off the throttle. It is the worst around 40-50mph, but continues after that.

I have been looking on hear and some people say U-joints. My Dad said he read about transmission/torque converter problems that happen around 40 mph. Any thoughts?

[big marc]

its probly the U joints, my old truck did the exact same thing!

[460+]

Check the carrier bearing if its got one, thier bad about the rubber going out of them. And if the u-joints are rusted there wont have any play but will be stiff.

[the sad]

Turns out it was a u joint. Whew, glad that's all it was.