shifter free play

When my tranny is in gear I have very little play. Actually the only time I felt play in my shifter when it was in gear was when bolts were coming loose on my short throw shifter. Almost sounds like you have bent shifting forks if you have a lot of play.
 
There will be a few inches of play if the shifter 'cup' came out when the shifter was installed.

Or it could be broken.

The shifter cup is a couple $ at 50resto.com and the ball end of the shifter goes inside it.

I had that problem before...