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- Planetary Gearset Model, Made by Howard Simpson for Chrysler Corporation, circa 1959 - Following time at Ford Motor Company and Detroit Harvester, Howard Simpson retired to pursue work on planetary gearsets. His designs were licensed and manufactured by Ford, General Motors and Chrysler, and Simpson gearsets became common in automatic transmissions produced through the latter half of the 20th century. This model represents a three-speed unit created for Chrysler's Valiant compact car.

- circa 1959
- Collections - Artifact
Planetary Gearset Model, Made by Howard Simpson for Chrysler Corporation, circa 1959
Following time at Ford Motor Company and Detroit Harvester, Howard Simpson retired to pursue work on planetary gearsets. His designs were licensed and manufactured by Ford, General Motors and Chrysler, and Simpson gearsets became common in automatic transmissions produced through the latter half of the 20th century. This model represents a three-speed unit created for Chrysler's Valiant compact car.
- "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.