I took all the body mounts off the 66 frames and put them on the 77 frame. The width of both frames are the same. The problem was the heigth of the frames compared to each other. I had to use spacers....that look similar to a body lift....to get the body mounts into a good mounting position on the 77 frame. The 77 frame has a tall cross member, where the rear floor board would be. The back of the 66 cab is layin on it.
