One post wonders tend to pop up when there's a problem and someone is searching for an answer they haven't found yet....
I actually bought a 2016 Journey back in August and started experiencing the same issue within weeks of purchasing it. Took it in, dealership couldn't replicate it. Took it back in, said it was defective half shafts, so the dealer replaced them. Immediately found that it did not solve the problem so I brought it back in and they greased the half shafts, no fix. Brought it back and they got with Chrysler Technical, told them to re-grease them (???), no fix. Brought it back in, Technical had them replace bushings for the stabilizer bar, they called me back and said that the noise now almost sounds like its coming from the transmission (again, ????). Technical has them now replacing the wheel bearings, but did not sound confident in that solution and waiting to hear the outcome. 2 weeks in the shop for their most recent repairs/diagnosis.
Vehicle with 8,500, mostly highway miles on it. I'm at a loss myself.