There's a magnetic plug in the Tcase which keeps stuff pretty clean, unless it was ran low on fluid it should be fine.
i beat the **** out of my iX every chance i had for many years. lots of stuff broke, but never the driveline.
Hot: 2001 Estoril M Roadster
ZCP 19's, ZHP knob, JL 8W3
Cold: 2002 TiAg M3 6mt
ZCP 19's supersports, ZHP knob, UUC short shift GROM, OEM 18's w310's,
http://absolutehid.ca hid kit