Steering column wont go into park???

[brawley]

I have a gmc van tilt column with automatic. I recently took it out to paint it, I took the shift lever out. Now ive put the column back in, and shift lever in , the shift bowl moves freely until I get up around where reverse is and it stops , when I pull back on the shift handle it wont go up into park it seems stuck?? any ideas , or an exploded illustration of one of these columns. thanks