This is the video Upallnight is referring to: (watch at 1m10)
2005 BMW X5 TRANSFER CASE ACTUATOR - YouTube

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His : 2005 X5 4.8is (SOLD)
Hers: 2007 X5 3.0si (SOLD)
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Retired:
1999 518
2000 323i
2002 M3 (beautiful car)
2003 330Ci