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After working on the truck a few hours this afternnon I have ruled out tires, rear end and drive shaft. While the truck is in park I can rev the engine to about 25k. The vibration is clear and present!

Now.... what next. I did replace the fan clutch (bearing was worn out). Vibration still there.... torque converter? flywheel? pressure plate? harmonic balancer? Any ideas on how to rule these out?

I did check all the ground, timing, vac leaks no problems found there.

Is there another tread out there I should be on since I have eliminated that the truck does not have to be in motion?

Thanks again for everybodys help

Mike