There is a stud holding tranny support that is welded in the back center If you don't oil it or WD-40 before, It could unweld and you are going to have a hard time to unbolt It. It took me 1 hour to cut It with a hand hafl steel saw by holding to other end with a vise grip!!!, when reassemble I put on a normal bolt and nut, never in the future...
Good Luck Dude's