John Deere 4300 won’t move

[Smalltimefarmer77]

Help! Was moving snow with blower yesterday and the roll pin on snowblower broke making the PTO shaft fall off. By the time I got tractor off it had already done the damage. I no longer have a PTO or any gears to move it. Did I take out all the gears when the shaft spun around and hit everything on rear or is there a shear pin inside tractor that is hopefully the issue? If so how do I access it? Can’t find much online yet on this. It’s a JD 4300 9x3 syncshift. It starts and will run but like I said no longer have PTO or any gears. What did I break? Thanks!