MOPAR offers a FOX stabilizer which will solve all your issues. If they put another factory one in it it could honestly fail at any time. The dealer can order and install it for you
Most likely, as it's the only "upgraded" stabilizer that Mopar offers. The new stabilizer will come with a 2 year unlimited mile warranty through Mopar. You won't be able to get it covered under the factory warranty extension anymore, however.
No. It's a MOPAR direct upgraded part. MOPAR is Jeep's parts division if you were unware. All MOPAR upgrade components are confirmed to never void any factory warranty. It's one of the reasons they sell well compared to regular aftermarket components.
Did you not get a Carfax? It would say if it was a lease or not and any other mechanical history (if reported). I would never trust a dealer to tell me the history of a car. It is always “Oh, it was driven by an old lady or mechanic“.
Hard to say what it is exactly without seeing it, Jeep steering isn't super expensive, most likely is a ball joint or other bolt that needs tightening to spec but making sure your tires are evenly inflated, and not worn funny and getting the dealership to throw it on the alignment rack would go quite a ways to diagnosing this without spending big money.
