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The only dimension is 39.33" from the centerline of the axle to the back of the bed on the F1. I don't see the dimension to the back of the frame and I can't measure mine as I have modified it. Good luck
No. The F-1 diagram is online and from one of the 1948-1950 Ford Body Builders' Layout Books. . I find no online diagram for an F-2 or F-3, but did find the F-4 diagram. I have the 1953 and two later full copies of the books but so far haven't found any earlier versions. Stu