Pictures of the vehicle really would make this easier!
The truck is a Ford, but it could be one of several models. You haven't given any description of the size of the truck, length of the tray, or cab arrangement.
It could be:
A '41-'45 F15 2wd Blitz, or
A '38-'41 C81T, C91T or C01T Modified Commercial Pattern, or
A '42-'45 FC60L Modified Commercial Pattern 3 ton truck, or
A '42-'45 C218T Civillian 3 ton truck.
Ford vehicles in Aust service did not always have chassis numbers stamped on the chassis, and when a number IS found on the chassis, it is the engine number which does not necessarily ID the type of vehicle. Canadian factory data plates could be found on the Driver's door, the dash panel or on the engine cover DEPENDING ON WHAT TYPE OF CAB is on the truck. The Aust Army Nomenclature plate is fitted on the dash or engine cover, again depending on cab design.