The explorer guys upgrade to the BW 4406 case, its just really tight in the ranger rails.
It may touch the frame, if it does you will need to decide what to do about that.
Ford has kept the same setup in the f150 for years. so cases back to the 70's will work. Even the rocktastic np 205, you just need to trim the trans for the shifter rails and build a crossmember to hold its 160 pounds.