Vibration at 60 mph

I have a 1998 F150 2 wheel drive. a few months ago I started feeling a vibration at 60 mph. It's not really isolated to the seat or steering wheel, you can feel it in both. I guess you could better describe it as more of a shudder than a vibration.

I have checked everything I can think of but still can't get rid of it. The U joints have been replaced. There isn't any damage to the driveshaft and the balancing weights on it are still there. The front wheel bearings are only a year old.

From what I can see, the transmission mount looks alright, but I'm wondering if it needs to be removed to be able to tell if it is really ok ?

If anyone has any ideas on other things I can try I would be happy to hear from you.:banghead:

have the wheel/tyre balance checked.

Brent W, any solutions ? I have the same thing

have the wheel/tyre balance checked.

Usually the case.