I found this for US trucks
http://1955gmc.com/1955-59gmcguide.html
But I don't believe I have seen anything for the trucks built in Oshawa. The service manuals do have some info in the front cover. There is always the GM heritage site that you can get info on the truck once you have the VIN,
http://www.gmcanada.com/gm/english/shopping/parts/vintage

Mark


1952 GMC 9430 one ton pickup, a work in progress

1952 1-ton pictures on Photobucket