Found the below on:
http://www.the-direct-source.com/info.php/Chevy-Truck.php Don't know if this helps.
-Randy
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1937-1940 First Modern Pickups
Chevrolet's modern pickup era began in 1937 when management filled in the holes in the model lineups. Prior to 1937 the company produced a Commercial model (1/2-ton) and a Heavy Truck (1 1/2-ton). The gaps were closed with the introduction of 3/4- and one-ton models. Actually these new models came late in the model year in July 1937. Another interesting development was that the trucks again shared the styling traits of automobiles. The new 3/4-ton truck had a wheelbase of 122 1/4-inches, a payload capacity of 1,500 pounds and a GVW of 5,800 pounds. The one-ton differed from the 3/4-ton in that it had larger rear brakes, heavier rear springs and bigger wheels and tires.
Available bodies included pickup, stake, and platform. The new pickup body had an inside length of 78-inches, an inside width of 45 3/4-inches and an inside height of 14-inches. Its capacity was 32.2 cubic feet or an increase of 13 percent over the 1/2-ton model.
