1957-60 VS 1961-64 F100 & F250 & F350 Frame Comparisons?
 

I am curious about the frame dimensions, and some of the more technical specifications of these truck's 'ladder frame' including the 'section modulus' of the F100 & F250 & F350.

Also, if possible, is there information to compare 1961-64 ladder frame to the earlier 1957-60 ladder frames dimensions, and, are they potentially interchangeable?

Thanks, Pete