Was watching a show on how they make Subaru cars in Indiana. Pretty sophisticated, what I noticed was a lot of the big forming presses and other large machines were made by companies that also made heavy equipment. The biggest machine I saw was made by IHI and there was also Komatsu machines. Thought it was interesting. From what I've seen on US designed vehicles, the big equipment is usually made by specialty manufacturers that you don't recognize from other common products that make.
Japanese companies are vertically integrated. Much like how USofA companies used to be.....
Most were formed or reborn after WWII and had to rebuild Japan before they also started producing goods such as automobiles. After the mass destruction of the Japanese cities they were forced to rebuild everything in a modern manner to compete. one of the things the people that scream about “but muh war crimes!” conveniently ignore is that the population of Japan was very much engaged in cottage industry. Firebombing the cities was the way to put an end to that.
Komatsu specialise in large presses for auto-manufacturing, and most of their press setups are now fully automated. They take in the sheet metal one end, and punch out the finished item in multiple, smooth, fully automated actions, the other end.