I got completely hosed by an eBay seller of longer splined front shafts. Hope you have better luck.

If you have spun yours, you need at least 3/4 longer, as the transfer case female splines are damaged and you need to engage the undamaged part way in there. Changing the output piece on the transfer case or a used transfer case would help

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David.X5
2001 X5 4.4i Sport
SOLD! at 160k miles