What are the tranny mounts for?it can be a lot of things though you can narrow them down since it's only vibrating in drive mode
Read this article..AGCO Automotive Repair Service - Baton Rouge, LA - Detailed Auto Topics - Finding the Cause of Automotive Vibration, Pt.2

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2006 X5 4.8is LeMans Blue / creambeige interior
Prod.date: 2006-06-21