Small update, I've noticed that the noise heard in my first video, the one I am trying to diagnose, is most often heard when the jeep is not moving. This has me a bit confused, due to the fact that if it were the differential mounts, they wouldn't really be moving/flexing at a standstill, would they?
Also, to this point, when the jeep is not moving, neither should any of the components in the driveline, correct? Only the engine would have moving components at that point, I believe.
Please comment if anyone has any other thoughts or if you can follow my jibber jabber.
2006 GRAND CHEROKEE OVERLAND