I got my car started today and didn't think to check trans fluid after my trans swap (oops) put it in drive to move it a little and have it has (got to about 4k) than let off thinking my trans was shot . I than put it in reverse and tried again, than back in drive (after real easing the parking brake thinking that was why) is my trans going to be shot? I'm going to go get trans fluid tomorrow and top it off., along with other odds and ends my baby needs if the trans isn't shot.

Edit: trans is just really low, I remember checking a while ago with the car off, so I know at least a little is in there.