Joined: Nov 2012
Location: Broken Arrow, Oklahoma!
Mine has done the 2-1 bump since day one. Sometimes it's more pronounced than others. It has done it with the stock, the 87S and 87P tunes and with both the 2.73 and 3.31 differentials. I ignore it.
The only hard 1-2 shift was with the 87S tune. The 87P tune has the "normal" 1-2 slide unless I lean into it. Then it's a bit more pronounced. I really like the 6 speed auto, 3.31 gears and 87P tune.
Santa Elena Canyon, BIG BEND NATIONAL PARK, TX 2014 Mustang GT Premium black on black and blacked out... MODS: Sound pipe delete, tint and 1-1/4 inch Draw-Tite hitch receiver (the towing package)