Nakajima Aircraft Company dissolved and was reborn as Fuji Heavy Industries, maker of Fuji Rabbit scooters and Subaru automobiles, and as Fuji Precision Industries (later renamed Prince Motor Company which merged with Nissan in August 1966) If not mistaken, Nissan made tanks and trucks for the IJA before and during the war.
Kawasaki also built fighters although not as famous as the Zeke, it Ki-61 Tony see plently of actions in the pacific.