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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