While researching the bed for my '46 Chevy I discovered that Chevy switched from Oak to Yellow Pine in 1940(?) to cut costs. Both the oak and pine beds were painted black, not stained or coated to make them "shine". However, if I were restoring a '46 GMC -- you
guessed it -- I would need to install a steel
bed! In 1946, this was more expensive, and the GMC was a bit "pricier" GM model with a few more features.