re: What's the difference between Chevy and GMC?

Way back when, General Motors, a holding company for Buick bought a truck manufacturing company and GMC Trucks was born. That's the only difference. They are built on the same assembly lines (don't know if this is still true) as Chevy trucks. I remember my dad buying a new 1976 Chevy Cheyenne that had Sierra Grande emblems on the dash.