Unlike RH71, I definitely get this in standard D mode (i.e. non-sport) on my 4.8i. I also recall it occuring on the 3.0si in standard D mode during test drives. I only have 1200 miles on my car, so perhaps this does go away after a longer break-in (as RH71 suggested previously). Though that would be pretty strange, since this seems like the way the transmission is designed to operate for whatever reason.