Would you mind taking a picture of what you did to the rear frame?
Sure thing. What I did was to make a cardboard template of the rear frame member, with bolt holes cut out. Then I took it to welding shop. They cut out 3/16 steel to match the template. I wish I went a little thicker 1/4 at least. Then I welded the new steel all the way around the rear frame to mate it up securely. Total cost $35.00 is what the shop charged me for the cut steel. I welded it in myself.
I tried to upload a picture for you but I received this error message. The website encountered an error while retrieving. Sorry no picture, hope the explanation helped.