I does look like a NAPCO, but didn't GM make their own 4x4 driveline by 1965?
I don't think Chevrolet ever built a 4x4 larger that 1-ton...I believe the larger trucks were all done by the dealer or owner, not factory.
Wasn't 1959 was the last for NAPCO in factory builds and 1960 the start of GM/Dana front 4x4 axles?
Mike B
