[aerotruk63]

That's interesting. I assume all the trucks were 1/2 or 3/4 ton. Napco still converted trucks if the client required for 1 ton and above.
I saw a conversion in Ontario of a 2wd to 4wd and the distinctive differences between was the hanger units for the leaf spring to frame were made with welded plate steel. The 4WD shifter was on the RHS of the four speed though I've now come to know that in 1960 the shifter was that way.
Hopefully Padresag will read this and chip in.
I'll check some literature I have, but it's all American based.
Perhaps if your serious about a truck you can have GM Oshawa run the Vin number.