F15 chassis: differences between Cab 11/12 and Cab 13?

[Hanno Spoelstra]

Cab 11/12 front crossmember (left) and the Cab 13 front crossmember (right) offered up to the upside down chassis:

[cletrac (RIP)]

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.

[Keith Webb]

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.

In other words they are the same general cab mounting, pedals and steering box changes between cab 11/2 and 13 as the heavier Ford range.