Yes. That truck is one of the largest available Road Tractors GMC made at the time. It would be called a 5 1/2 ton or more if memory serves me.

The 426 in the serial number confirms it is a 426 engine.

Jeff


My 1953 Chevrolet
1947.1 Gallery
1972 C-10 1/2 Ton & 1972 C-30 1 Ton