In many of the books and whatnot I've read about WWII, it's been noted that much (or at least some) of Germany's military was not totally mechanized. For example, some artillery units were still horse-powered.
What would the Nazis need to do to have a fully mechanized WWII army, and how would that butterfly things away? Would it lend itself to a greater change in the war or would things end OTL?