Chinito, Look at the radiator, it should be made by harrison and have a date code. Most likely it is a D 50, which means it's from a 50 GMC truck. Does it have tube shocks or knee action shocks? Knee action shocks were last used in 1950 and maybe some early 51 GMC'S. If it has the knee action shocks it also has Huck brakes, bendix brakes were used in the 1951 and later trucks. Check your pm's at the top of the page in the mystuff section
Check out
TIM LEDERMAN'S site for some great information.
