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Alignment can easily cause speed related vibrations. So can unbalanced wheels OR wheels dirty with hidden deposits of snow/ice/mud.

Have you tried Centrimatics and checking your alignment?

Tom, did you read through this thread?

Harmonic balancers supposedly break free of their woodruff keys and can loosen on the 6.2 engines. I would immediately stop driving and check! If that is the problem, replace the harmonic and re-install with updated longer bolt to secure it.