While driving my c280 mb, I could hear a wooing noise as if this noise is coming from the transmission, ,rear differential, may be the bearing in the drive shaft. This only happens when I am driving at speed of about 40-60 on the regular street. On the highway I would not hear it or feel it. By the way the this all started after I have changed the electronic shifter in the transmission, because when placed in drive and moving the transmission used to take a long time, but now it is shifting fine.
Could you tell me what could be the issue here.
Thank you.
Leslie