Did my 2017 GSA rear splines 6 months ago with 14K on it. A few tiny points of rust no real big deal. But it was disappointing to see the sever lack of moly by the factory so Im glad I cracked it open for a look see. Then while I was at it, separated the fr splines and gave them a splash. I had a difficult time getting it reattached so while doing spline maintenance in the future I wont completely separate the fr splines from the trans but pop it off the spring ring and pull it back just enough to check and lube then reengage the spring ring.