I had to pick my mom up at the dealership tonight (she is having the steering stabilizer recall work done on her JLU). While I was there I spoke with the service advisor about my issue and upcoming appointment. He seemed very knowledgeable and while he said he hasn't seen any of this specific issue come through the dealership as of yet on these vehicles he talked alot about specific things that have been mentioned in this thread like clutch pack could be to blame, or wrong fluid used, was able to describe what it would feel/sound like if there was an issue back there and was confident they would get it sorted out for me. As of now I'm feeling optimistic about next week's appointment. I will post an update on how it goes!