Ok, found the info. Our transfer cases are made by New Venture transfer cases and it looks like the 4.4i uses the NV 125. Here is a link to their site. Let us know what you find out.

http://www.newventuregear.com/tcases.html

These guys look to sell rebuilt ones: http://www.transfercases.com/

__________________
2013 X5 xDrive3.5i Premium
2002 530I Sport Package
2001 X5 4.4i
2001 M3