Tranny issues and questions

[4 Wheels of Fun]

This is not how I wanted my first post to go. The 2003 4.4i w/ sport package we recently purchased appears to be developing a transmission problem. Fortunately, the truck is still covered under the certified pre-owned BMW warranty until June. I noticed it in the parking garage this morning when I had the window down to get a ticket. It makes a metallic non-grinding noise as I accelerate away from a stop. I switched to manual and confirmed my suspicion by verifying that it didn't occur while in first or second gear. Does this sound familiar to anyone else who has experienced problems with the X5 V8 transmission? How do you think BMW will handle this? It's scheduled to go in to the dealer for other unrelated items next week. I informed them of my concerns today to have them look into it then and to get it on record.

I appreciate any advice you all can give me...this board has already saved me hundreds of dollars.