I read the information on the site and it stands to reason that it would mean the same on the trucks as the cars, however, I would like to see it decoded on a truck VIN. This is the best reference I have yet to see, on this site and a few others where I posted the same question.

Tony Smith
4-5-6 Chevy Trucks
501 Scott Avenue
Kansas City, KS 66105
913-207-7789
[email protected]
Photos: http://www.flickr.com/photos/4-5-6chevytrucks/sets/
Custom Parts: http://www.flickr.com/photos/4-5-6chevytrucks/sets/72157627022818563/
www.4-5-6chevytrucks.com