The steering wheel has too much play and the steering wheel sticks? You can't adjust the gearbox for that.

One thing you can check pretty easily is your front U-joints. Park with the wheel hard to one side and the front hubs out. Reach around and turn the U-joint around a couple revolutions by hand. Feel for any binding. Also check for slop. I had a frozen U-joint that manifested itself as a steering issue. The wheel felt like it would bind up.