i have a full stock 2012 v6 and i've had the 2-1 lunge since i bought it.
i had the dealer service the transmission, which made the lunge slightly less noticeable, but it still does it.
just another thing to get used to.
check out this thread on the clunk when shifting between park, drive and reverse... you may also be noticing this. https://www.allfordmustangs.com/forum...duced-now.html
bottom line is that the drivetrain is clunky, period.