The new truck model year being six months after the new cars does cause
some confusion when there are major truck body changes. However in the
case of my son's 1946 2 ton. It is titled as a 1947 yet it still has the 1946
body.

What correctly identifies the year of this truck is it's model code, PW.

The same 2 ton truck model for 1947 is model OW.

When dealing with Chevrolet trucks when there was a body change you are
best served going by the model designation for the year or you can sometimes
get the wrong part.

Also have been told back then title laws were looser and left over model year
trucks would get sold as new next years trucks. I assume because of the May
new model year date conflicting with the actual calendar date.