Gerard!

You can find out exactly what your truck is and even the day it came off the assembly line by contacting GM Vintage dept.
Call them toll free at 888-467-6853 or write them at 1908 Colonel Sam Drive, Oshawa, Ont. L1H 8P7. Give them the VIN and they can give you the information. My 1946 Chev., model 1543 is a 2 ton delivered as a cab and chassis.
Best wishes, George