Is your 42 3/4 ton a 6 lug truck? If so, the CPP kit should work...assuming of course that the 1/2 ton and 3/4 tons with 6 lugs share front axles. They may not. The hard part about the conversion is that you will have to fabricate your own bracket for the master cylinder. The 47-54 axle is a direct replacement for the 41-46 axle. Funny enough it is also an upgrade to the 1940 and earlier front axles because it uses larger king pins.
I plan to put a 2 1/2 to 3 inch drop axle in my 1940 3/4 ton from a 41-54 1/2 ton so I can put the 6 lug disc brake kit on and run original 16 inch rims. The rims rub the calliper a bit, but I think a spacer will solve that.
John
