Actually, looking at his original post and pic, it looks like he has 2004+ X5 with X Drive. He list his X5 as a 2004 and the pics look like the facelift E53.
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Originally Posted by weasel56
I'm can take from this that you have an 03 or earlier. What happens is the front output shaft is a splined slip joint and the splines wear abnormally sometimes then slip. The wear is usually caused by either different rolling diameter tires or water ingress into the splines causing rust.
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