The drum seems to be loosening from the rear drive

I have the exact thing happen and in order to get to the back of the drum you ll have to open up the unit and remove and split the whole tub assembly. What I found is the shaft that supports the stainless steel drum was broken in 3 spots(all 3 arms connected to drum). I ve done some searching and believe the part is about 250.00 so as for my washer I m looking at getting a new one. You could ask around I believe its called the drum support shaft but for me I m looking for a new unit possibly a LG. I hope this helped you out.