I'm not too sure Chrysler ever actually produced their own diesels. The marine ones I've seen were Nissan, and it seems to me that if Chrysler had the same Diesel experience under their belt as GM (NOT Detroit) they would have their own engines in their diesel trucks, instead of Cummins. Even the firs few years Ferd offered a diesel truck were IHC engines, complete with IHC on the valve covers.
some more:
Chart at the bottom shows Chrysler using all kinds of "other people's" diesel engines
"1939 brought a complete redesign, with streamlined styling. After that, prewar changes started. In 1940, engineering started on a military four wheel drive truck, leading to the first stock light-duty four wheel drive pickup in 1946; these were made in a new, massive truck plant. Dodge also made their first diesel truck, using their own diesel engines. Only two automakers made their own diesel engines for their trucks before World War II: Mack in 1938 and Dodge in 1939."
I'll tell ya---information about this is tough to find and far between