Jed you should not run that washer anymore until the transmission is drained and rebuilt. That grinding is the agitation gears grinding together and wearing out because either they totally dry and no oil is on them or they are soaking in a water bath. Now go unplug that washer 
You can lay the washer on its side (don't forget to put padding down) and you can take a vice grip and get those screws turning from the inside out.
You can lay the washer on its side (don't forget to put padding down) and you can take a vice grip and get those screws turning from the inside out.