Richard,
here is a decoder site for the Canadian GMC trucks. I think you will find the encoding very similar except where the Chev model number starts with "1", the GMC model number starts wirh "9".
http://www.oldgmctrucks.com/page0185.html

You may have found yourself a nice project!


1951 GMC 1 Ton Flatbed -- It is finally on the road and what a great time I have driving it!
1951 1 Ton Completed


My Chevy Master 4 Door is on the Road!