At this point I hope it is the transfer case. I have been searching for this for months. The shop foreman at the dealer said it was the clutch in the transfer case. It looks like I can rebuild the older one in my 09. I have rebuild many TCs in Jeeps. ATC500 700 Transfer Case Friction Clutch Repair Kit BMW x5 E53 E70 2003 2009 | eBay
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2009 35d, 2006 325i & 330i
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