RE: Rear end Wronk/Creak
I haven't heard that in my R/T yet (I still have less than 300 miles on it, since the weather has been so unsettled here the past week), but I've heard a sound that sounds like you describe in my Jeep Grand Cherokee w/the V8 hemi.
I can't pin it down - maybe a u-joint or the rear end or possibly the transission shaft.
It's been annoying me all summer but I figured I'd wait & let my dealer hear it when I go in for annual state inspection (I have a lifetime drivetrain warranty and I know all my fluid levels are good and according to my maintenance book there's nothing else I should be checking and the vehicle has had NO abuse).
So I had it in this past week for the inspection & the Jeep/Dodge mechanic couldn't see anything & passed it with flying colors.
Arg. So I'll keep driving and if it gets worse I'll let em listen again.
Hopefully that lifetime warranty will be honored by whoever buys Jeep (AND by whoever buys Dodge!).