Originally Posted by bcredliner

There are several threads about transmission issues. One that might be worthwhile to read follows: http://www.xoutpost.com/bmw-sav-foru...s-summary.html As mentioned, updated software may resolve the issue but I would not spend any $$ on a possible fix until you have a well recommended transmission specialist who is familiar with BMW transmissions complete a diagnosis.

Mgmarsh, I see you have a 4.6. FYI- the torque convertor in your X is not the same as used in the other models. Also, one thing I have done that you might consider is adding Dinan transmission software. It not only changes the transmission shift points but in the manual mode the shifts are faster, firmer and you have more control when the shift takes place.