Something else to check: Does the shifter seem to move easier than normal? Its possible the shift cable broke inside the casing therefore no changing of the shifting at the transmission. I checked this by having someome do the shifting while I observed the shift mechanism at the transmission. When the connection didn't move when the shifter was moved, I knew then it was the cable. Had this problem a couple of years ago on my 98 Taurus. It was a bit of a pain, but was able to change out the shift cable and had no more problems since. Just a suggestion. Good Luck.