I'd look into replacing that differential since the tranny has recieved a lot of attention over the past few years. Allthough, if ATF was getting into your diff then there's also the chance that diff fluid is now mixed in w/ you ATF. Perhaps Smart Service could swap the diff for you. I'd also ask them for thier opinion of how you should handle this before you proceed. The dealership will want to install a new tranny.... I've lost faith in Dealership shops. The tech at Chaplin's in Eastgate (Belllevue) is really cool and takes my calls to answer quick tehcnical questions about my Suby though. The Kirkland Subaru techs are the ones that ruined all thier chances though.

Good luck Ally, NWSVX wouldn't be the same w/o you. I really really really hope you pull through this!