transmission wont go all way into park

So I been driving the car around for a while now. Took it to a show yesterday and everything worked like it should. I go to start this morning for another show and it wouldn't start so I checked to see if it was in park moved a bit then I went to the store on way to show put it in park and it kept rolling backwards. Now only way I can get it to start is if I reach under car and push arm into park. I tried adjusting everyday possible so it just will not go that last bit into park. It's like it stuck in between park and reverse. I even tore shifter cover off to see if anything fell apart can't seem to find anything. Its a b&m shifter, B&m cable and B&M bracket on a 727.