A very similar thing happened to me. My front diff case on one of the mounts failed on a very minor “hop”. Not sure if there was actual air involved, but the dealer saw a few bits of mud under it and denied my coverage. I had 3.0 FRS on all 4 corners, so I wasn’t completely stock, but it ended up costing me 2K in parts and labor to fix. I sure as hell wasn’t going to pay 4K at the dealer. All the internals of my diff/torsen and axles were fully swapped over and fine. I even showed them what looks like a casting defect along the break….no cigar. I went a couple weeks fighting ford corporate and all the nonsense and decided to just sort it out myself. I’ve got more pictures. This was a 1.5 year old or so 2020…FYI.