Vehicle: 1997 Grand Prix GTP - 4T65E-HD

Ok, so I was on the highway heading home and intermittently my vehicle would start vibrating. So I tried diagnosing it a little while on the highway. When I would turn the wheel left nothing would happen, but when I would turn right it would make a small clunking sound.

I pull over off the exit to look at my vehicle - didn't have my tools on me. I turned the wheel all the way to the right to look behind the wheel to see if I saw anything and I noticed my CV boot was ripped to crap .....

I proceed to take off the wheel and I cut away the rest of the boot because it was kinda wrapped around the cv axle - wasn't protecting anything. Grease not even there any longer (its been raining like crazy lately).

Also, I grab the CV axle and it has SO MUCH play in it! Up, down, left AND right. Moves like no other.

Anyway, I put the wheel back on and tried moving the car. The vehicle wont move at all now..... Initially I thought maybe to just replace the cv axle (which i KNOW is needed) --- but the vehicle is making a noise when the car starts - as if its not really in park.

So i put it in park and let my foot off the break and it tries rolling back ( i was on a small decline)....

IDK what the issue is...not sure why the vehicle is still trying to move. And when I start the car its like its trying to move the CV axle or something 'cause i hear clunking sound (vehicle is in "park").

Can anyone help? What would a bad CV axle cause to go wrong? This stuff all happened like literally within 15 minutes of me knowing the issue.