Billo, the '47, & '48 GMC front bumper has a more car-like styling to it. Has more of a curvature than the '49-'54 bumper. They also use the same hood ornament as the '46, & '47 Oldsmobile car. GMONIZ has a link above to examples.
Spanky Hardy Collector Of Fine Old G.M. COE Trucks & Antique Holmes Wreckers
