I have a Cab 11, a Cab 12, and several Cab 13 F15As and the ones that have overload springs have "farmer fix" overload stops bolted to the frame. This leads me to believe that none of them came out with overloads. And here I was thinking that farmers would never overload their vehicles! My HUP was cut down and had a 150 bushel box on it. That's 9000 pounds but then it had added overloads.
Another difference that nobody has mentioned is the steering box bolts go down through the frame rails on an 11 or 12 cab and the cab 13 has that bracket to move the box outwards a couple of inches. This is to make up for the wider cab on the Cab 13s.
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1940 Cab 11 C8 Wireless with 1A2 box & 11 set
1940 Cab 11 C8 cab and chassis
1940 Cab 11 C15 with 2A1 & Motley mount & Lewis gun
1940 Cab 11 F15A w/ Chev rear ends
1941 Cab 12 F15A
1942-44 Cab 13 F15A x 5
1942 cab 13 F15A with 2B1 box
1943 cab 13 F15A with 2H1 box
1943 Cab 13 C8A HUP
1944 Cab 13 C15A with 2C1 box
1943 Cletrac M2 High Speed Tractor
MkII Bren gun carrier chassis x 2
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