At least you got them to do something. On my T/A 392, I had a similar issue and I kid you not, the service advisor said, "We inspected it, but the car isn't throwing any codes, so we're at a loss for what to check."Did you ever get this resolved on your end? Been having the same issue for a few months and am 3 service appointments in with no solution. Just opened a dodge cares case and hoping to get it resolved but I wanted to know if you had any luck?
For me the problem started at 1500 miles, exact same sound your reporting. They tried to replace the strut mount assembly and some bushings but no luck.
I asked him what the bushing failure code is on a Mopar. I'm still waiting on that return call