CW - yep, that's the exact sound the rear CV (at the front to the rear diff - on the rear end of driveshaft) makes when it goes dry. Did you replace or re-pack this CV when you serviced the driveshaft?

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Wayne
2005 BMW X5 3.0d (b 02/05)
2001 BMW F650GS Dakar (b 06/01)