Chevy, as far as I know, looks at all CK trucks to be 1946 trucks. That is why I suggested getting the restoration pack from GM. It will say without doubt if the truck is a 1945 or 1946 model.
There is no Rstoration Pack available for the '44/'45 trucks, it skips from '52 to '46, with '46s listed as DK. As mentioned, many states registered vehicles by year sold, rather than model year. I've seen cases of '57 Bel Air coupes (which has very distinct differences from the '56) registered as '56s, simply because they were sold in '56. Same goes for cars sold late in the year, like the late production '69 Camaro.
