Just checked this....haven't messed with it yet.
As for the drive shaft.....vibration occurs with truck not moving and when moving. Drive shaft is speed related, not rpms.
Can a pulley really make the whole engine vibrate? I've always diagnosed pulley bearing with stick/pole method. Put one end on the part by the pulley and the other on your head by your ear. You'll know if it's f-ed up.
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Why didn’t you tell us the vibration is there when the truck is not moving?... we could have eliminated some mental-masterbating!
I think I understand RPMs and speed. How can you have speed without engine RPMs unless you are coasting, being towed, the truck is riding on a trailer, or Scotty has locked on to it and it’s being beamed up to the transporter room!!
You stated and asked about clutch chatter and backing up a hill, isn’t that “moving”, and in gear and out of gear.. I would think that would be “moving”?
I’ll let one of the experts here help you figure it out.