There is no ID tag on the cab. Just a plate on the inside of the cab, dead center on the fire-wall hump that I believe will tell which plant the truck was assembled in. I believe that tag also gives info of the tun-age?
This web site should help. If you have the original motor...

www.gmheritagecenter.com/docs/gm-he...mation-kits/Chevrolet/1946-Chevrolet.pdf


Darrell, W.L.
1939 Chevy COE tow truck/My Stubbed toe
1939 Chevy 2 door Sedan

Car chat means talks about Chevy's. All other car makers only build transportation.
I don't work on my cars, I entertain my self in my garage, so my nabor tells me.