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They are different. All the holes won't be there. I also found that the wheel arch is different.I converted a 2wd to 4wd by making jigs off my old frame to locate holes. The two frames I used were a 78 4wd and a 79 2wd. If I had to do it over again I would cut the frames and weld them together. Mine was perfect from the cab forward but rusted in the back.