steering wheel vibration is not related to the drive line.
steering wheel vibes will originate from the tires, the CA bushings, the alignment, the tie rod, or the tie rod ends. i have recently upgraded everything and i still get this very slight shimmy around 55-65mph with the stabilizer on (a lot of people have this problem).
drive line vibes will be felt in the shifter and possibly the seat (like a dull grinding that worsens). they are not speed related, they are RPM related.
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2005 Grand Cherokee Limited HEMI (fully optioned)