Thanks for this informative post.
I just bought my youngest son a 2013 Titanium with the selectshift tans and he was complaining that if he was in Drive, going under 25mph, let of the throttle, then back on it would make a grinding noise. If he was more aggressive on the throttle then no noise. We tried running in Sport mode and no trans/clutch noise no matter how he drove or accelerated.
My summation is that Drive should really be Economy mode and only suitable for highway or freeway driving.