Gm built

[astroracer]

There was a day when GM made "most" of the components required to build a vehicle. Those are long gone. Outsourcing has been around since the automobile was invented.
Even in the early years "Fisher Body" made the coachwork. AC Spark Plug made plugs, AC Rochester did electrical, American axle made axles, Kelsey Hayes and motor Wheel did wheels, Delphi did instruments, Lear did seats, and jobshops did a lot of the design work. NOTHING is done by a major manufacturer now-a-days that doesn't include outsourcing... Thats why we have a global market and everything is so volatile.
Mark