Canadian built and sold trucks within Canada do have a GM histroy available for about 45 bucks.. all you need is the vin and you can order a package from GM that will list all your options as to the way it came off the line and even the dealership that sold the vehicle.. unfortunately I dont know of a sourcce for US made and sold GM vehicles.
from there site.
Call us with your Vehicle Identification (Serial) Number toll-free (in Canada) 1-888-467-6853, between 8 a.m. and 5 p.m. EASTERN Time. (Outside Canada 1-905-644-3387 or 1-905-644-4060).
A nominal fee applies for the research service:
$45 Cdn. + GST & PST (ON) for 1964 to current vehicles $25 Cdn.+ GST & PST (ON) for vehicles 1963 and older.
http://www.gmcanada.com/english/main...arts_vint.html