If you can't feel the gates, as in you can move the shifter from the top extreme left to the top extreme right without hitting any thing, then maybe a broken bolt that holds the linkage inside the tranny. At least that's what happened to mine.
Ended up getting it rebuilt under extended warranty because it was something that broke inside.
Hope this helps and isn't the problem, but shouldn't take to long for a good shop to fix.
Mike
