Find out where the problem is before ordering a shaft. The LCI models don't really have front driveshaft issues like the earlier X5's did. We have our own set of issues. Some inspection is in order to pinpoint your issue. Though, after 140,000 miles... if the rear shaft has never been serviced (flex disc, CSB) then count yourself lucky it didn't make noise or vibration until now. The front also has a flex disc, but no CSB. The rear has a CV joint that mates to the differential.

__________________
2005 X5 4.4i Build 04/05 Maintenance/Build Log
Nav, Pano, Sport (Purchased 06/14 w/ 109,000 miles) (Sold 8/15 w/121,000 miles)

2006 X5 4.8is Build 11/05 Maintenance/Build Log
Nav, DSP, Pano, Running Boards, OEM Tow Hitch, Cold Weather Pckg (Purchased 08/15 w/ 90,500 miles)

2010 X5 35d Build 02/10
Nav, HiFi, 6 DVD, Sports Pckg, Cold Weather Pckg, HUD, CAS, Running Boards, Leather Dash, PDC, Pano (Purchased 03/17 w/ 136,120 miles)