I got 2003 325I. Since i got it i hear noise in transmission while i was slowing down. Noise was in sports mode and steptronic. There was a thumping when i was stopping too. I took my car to a dealer 7 times and they finally decided to change my transmission after 5000 miles on it.. I took my car in the morning at 8 AM and they called me at 11 AM and said it's done. I went to a different dealership and asked how long does it take to change transmission, and they told me it takes about 8 to 9 h all together. Now i have 12,000 miles and noise is still there. Service says it's normal. I think they did not even change it.
Do you hear something like a whining sound?