steering gear box

I've had this annoying loose play at my steering wheel for as long as I can remember on my 2004 Tahoe. I recorded a video of me in the driver's seat with the truck off and in park. I'm able to easily nudge the steering wheel with just a finger. Is this normal?? For instance, was this...

I have a 96 Tahoe 4wd and I recently took off the steering box to replace the pitman arm. when I pulled the steering box out the whole shaft came with it. when I went to put the shaft back on I heard something hit the ground and it was a small rectangle metal piece. it had grease on it and I...