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- "New 1960 Plymouth 3 Speed Automatic Transmission," circa 1959 - This diagram illustrates an automatic transmission developed for the Plymouth Valiant compact car, introduced for 1960. The three-speed unit used a planetary gearset based on a design by Howard Simpson. Simpson's gearsets were licensed by Ford and General Motors, too, and they became common in automatic transmissions produced through the latter half of the 20th century.

- circa 1959
- Collections - Artifact
"New 1960 Plymouth 3 Speed Automatic Transmission," circa 1959
This diagram illustrates an automatic transmission developed for the Plymouth Valiant compact car, introduced for 1960. The three-speed unit used a planetary gearset based on a design by Howard Simpson. Simpson's gearsets were licensed by Ford and General Motors, too, and they became common in automatic transmissions produced through the latter half of the 20th century.