Automatic cars, in the modern sense of using a self‑shifting automatic transmission, started appearing in the late 1930s and early 1940s, and then became common after World War II.

Key dates in one glance

  • Early experimental “automatic” gearboxes appeared in the early 1900s, but they were crude and not widely used.
  • A notable early automatic-style transmission was the Sturtevant “horseless carriage gearbox” around 1904, which could change gears by itself but was fragile and rare.
  • In 1921, Canadian engineer Alfred Horner Munro patented an automatic transmission using compressed air; it worked, but it was too weak for mass-market cars.
  • In 1932, Brazilian engineers José Braz Araripe and Fernando Lehly Lemos built the first practical hydraulic automatic gearbox design, later sold to General Motors.
  • For the 1940 model year, GM launched the Hydra‑Matic, the first truly usable, mass‑produced fully automatic transmission, offered by Oldsmobile and Cadillac.
  • By 1948, the Oldsmobile lineup featuring these transmissions helped make “automatic cars” a mainstream reality for everyday drivers.

So, “when were automatic cars made”?

If you’re asking for the first real, production automatic cars people could buy , the key moment is:

  • Late 1930s–1940: First mass‑produced fully automatic transmissions (GM Hydra‑Matic) in production cars.

If you zoom out a bit, you get three useful answers to “when were automatic cars made”:

  1. Earliest concept attempts: About 1904 (Sturtevant gearbox era).
  1. First serious engineering step toward modern automatics: 1920s–1930s (Munro’s 1921 air-powered unit, then 1932 hydraulic designs).
  1. True modern-style automatic cars you could just buy from a dealer: Around 1940, then rapidly expanding after the late 1940s.

Tiny timeline story

Picture the early 1900s: cars are jerky, loud, and every gear change is a small wrestling match with levers and pedals.

Tinkerers try clever self‑shifting gearboxes like the Sturtevant unit, but they break too easily and never catch on.

Jump ahead to the 1920s–1930s, and engineers are chasing a dream: a car that “just goes” when you press the pedal.

Compressed‑air systems and experimental hydraulics show what’s possible, but only when GM refines the Hydra‑Matic for the 1940s does the idea truly land in everyday driveways.

From there, automatics become a defining feature of American post‑war car culture, and over the decades they evolve into the smooth, computer‑controlled units in most modern cars today.

Information gathered from public forums or data available on the internet and portrayed here.