Sometimes I hate being right
From this thread:
http://www.e90post.com/forums/showthread.php?t=708132
"Documented failures of x-drive transfer cases seem to all stem from the worm gear/cog interface (x3's, typically). The main reason is that the cog is a plastic gear that isn't intended to take large loads. The secondary reason is that through normal driving, the cog/worm gear will only cycle through a very narrow range. As such, it is my feeling that this is the first point of failure."
__________________
Go: Cobb S2+, Big Tom FMIC, CP-E DP & DCI, Royal Muffler, AR OC
Turn: TC Kline/Swift SA, Vorshlag Plates, UUC Front Bar, H&R M3 Rear Bar, VAC endlinks & spacers, Forgeline 18x9.5/NT05 265 Square
Stop: Endless MX72, Stoptech Rotors/Lines, Motul RBF600