This has been discussed in the threads CMP chassis and Australian CGT mystery, but no conclusive answer has been found for the auxiliary springs on the rear axle.

Other noteworthy (i.e. all - we are anoraks!) points of interest are welcome, too.

Thanks,
Hanno

chassis
 

The differences are the two cab mounts at the front rather than the single centre mount for a cab 13, and the brake and clutch pedals need to be changed because of the different length between the cab types.

Re: chassis
 

Plus the early chassis had auxiliary springs? Ref. CMP chassis

http://www.mapleleafup.net/forums/at...=&postid=60695

H.

No Auxillary springs on this F15:

Nor on these:
http://www.oldcmp.net/Images/F15page/euf152.jpg http://www.oldcmp.net/Images/F15page/Ouyf151.jpg

But this one has:
http://www.oldcmp.net/Images/F15page/f15drews.jpg
Source: http://www.oldcmp.net/f15.html

I'm :confused !
Only thing I can think of is that auxiliary springs were an option, but who/what decided they were to be fitted?

H.

Again, an F15 without auxillary springs:

http://www.oldcmp.net/Images/F15page...ov/recov05.jpg
Source: http://www.oldcmp.net/f15recov.html

Keith, do you still have this F15?

H.

F15
 

Yes I do. It's located with a number of Euan's trucks, currently on the back of a Steco trailer. One day it will re-emerge though.

Max and Chris sent me a couple of pics of Max´s F15 Cab 12 chassis. Note the differences between the centre Cab 13 mount (unpainted crossmember, top) and the front Cab 11/12 mounts (black crossmember, bottom):

http://www.surfacezero.com/g503/data...m/P1020051.JPG

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

http://www.surfacezero.com/g503/data...m/P1020047.JPG http://www.surfacezero.com/g503/data...m/P1020045.JPG

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.

Differences
 

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.