Trucks were constantly changing yes.. but most of the changes were from 43+. Ok, you win, some did start in the last quarter of 42, but production numbers to not justify adding a disclaimer to account for significantly less than 60k or so trucks (out of over 519,000 production) that had SOME of the changes in a very small portion of the production year. It will suffice to say that the vast majority of production changes affected 43-on trucks. The open cab appeared in August 42, and in limited number.
If you have specific 42 production numbers to back up a significant number of 1619 cabs please post it.. it would be interesting to figure that out.
This is funny... as it it contradicts everything I have in print:
From
http://www.globalsecurity.org/military/ ... nd/m35.htm"Production of the GMC Truck, 2-1/2-ton, 6 x 6, Cargo, CCKW "Jimmy" or "
Deuce and a half," began in 1941 by General Motors Corporation and ended in 1945, with
562,750 manufactured. This GMC truck was the most commonly used tactical vehicle in World War II. The GMCs were originally fitted with a sheet metal type cab.
This was replaced after July 1943 by a tarpaulin or canvas cab, not only for the economic use of steel, but saving volume when transported by boat."
I don't know where they got 562k production number, nor what a 'canvas cab' cckw cab looks like. A rare airborne variant?
The GMC CCKW was not called a Duece and a Half. I generally stop reading when anyone makes that claim.