Has anything happened to your truck lately? Hit a big pot hole, etc.? Have you been off-roading?
Sounds like something loose or something bent. Could be as simple as wheel weights missing, or mud/dirt caked up on one side of a rotating assembly.
A bent wheel, axle, driveshaft, or damaged U-joint could be the cause.
Is the vibration speed specific and independent of the speed of the engine?
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