Technical DIVCO questions

I just bought this DIVCO and was hoping to get a few answers and suggestions. First off, does anyone know how to figure out the year by the serial number? I'd like to keep the stock frame but upgrade the suspension and drivetrain. Any suggestions or experiences would be greatly appreciated. Thanks
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I've got a listing of approx. year by model#, but not serial#. Post the model# and I'll give you the years of that model. Just by the grille, yours is older than 65.

 

The plate above the windshield shows "Model 11 UM-9

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1949 and 1950 Total of 2404 produced.
This from Divco the history of the truck and company
by Robert Ebert & John Rienzo jr.

 

http://oldcarandtruckpictures.com/Divco/BobPatterson/

http://www.jalopyjournal.com/forum/showthread.php?t=282902

http://www.jalopyjournal.com/forum/showthread.php?t=155789