I had reviewed the dimensions that you included in your post a few times...very carefully...and then measured what I had...the best I could. And I couldn't come up with a definitive answer as to what year chassis I had.
As a result of seeing your post, I went at it again with a tape measure, framing square, level and masking tape to mark spots on the floor. I still couldn't get a measurement of the length of the frame that was conclusive. But, as I was determined to finally put this question to bed, I removed the hubcaps rather than trying to eyeball the center of the wheels and used a framing square to line up the center of the hubs with a mark on the floor. I have a 115" wheelbase.
Trying to figure out what frame I have has been complicated by finding more than one source on the Old Car Manuals site that shows the measurement across the rear of the frame to be 44 1/4". (See attached scan) I found that in manuals for 1941 and 1942-'46 shop manuals. I have heard that there are mistakes here and there in the documents, but this one seems to have tripped me up. (Perhaps I have been reading something incorrectly...I have been know to do that!)
I now believe that the 115" wheelbase is the factor I should depend on.
Again, thanks for your assistance!
Nick 1940 KC Model 1/2 Ton Pickup Project (with '37-'39 Bed and what we think is a '42-'46 Frame) Taos, New Mexico
