Which unlikely brand collaboration during WWII resulted in the development of the iconic M4 Sherman tank's final drive and transmission system?

Throughout military history, strategic brand collaborations have shaped the development of warfare technology and equipment. During times of conflict, civilian companies often pivoted to military production, creating unique partnerships that changed the course of history. This poll tests your knowledge about one of the most significant industrial collaborations during World War II that had lasting impacts on military equipment development.

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Ford Motor Company and Chrysler Corporation
General Motors and Singer Manufacturing Company
Cadillac (General Motors) and Buick (General Motors)
Willys-Overland and Boeing Aircraft