The 1941 M4 Vacamatic transmission by Chrysler was, historically, the first semi-automatic transmission which was marketed by a major manufacturer. It was an attempt to compete against rivals' hydraulic automatic transmissions, though it still had a clutch, primarily to change range. In normal driving, the clutch is not used. The transmission itself was a fully-synchronized manual transmission, with four forward gears, one reverse; where the shifting was done 'automatically' by either vacuum cylinders (early, M4), or hydraulic cylinders (late, M6, Presto-Matic). The main difference was the addition of a fluid coupling between engine and clutch, and the shifting mechanism.
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| - The 1941 M4 Vacamatic transmission by Chrysler was, historically, the first semi-automatic transmission which was marketed by a major manufacturer. It was an attempt to compete against rivals' hydraulic automatic transmissions, though it still had a clutch, primarily to change range. In normal driving, the clutch is not used. The transmission itself was a fully-synchronized manual transmission, with four forward gears, one reverse; where the shifting was done 'automatically' by either vacuum cylinders (early, M4), or hydraulic cylinders (late, M6, Presto-Matic). The main difference was the addition of a fluid coupling between engine and clutch, and the shifting mechanism. (en)
- Históricamente, la transmisión M4 Vacamatic de Chrysler, presentada en 1941, fue la primera transmisión semiautomática comercializada por un fabricante importante, en un intento de competir contra las transmisiones automáticas hidráulicas de sus rivales. El sistema todavía disponía de un pedal de embrague, aunque solo para poner el vehículo en marcha. En conducción normal, no era necesario emplear el embrague. Utilizaba una caja de cambios manual totalmente sincronizada, con cuatro marchas hacia adelante y una hacia atrás; en la que el cambio se realizaba 'automáticamente' ya fuese mediante cilindros de vacío (en la versión inicial M4) o bien mediante cilindros hidráulicos (en la versión posterior M6 Presto-Matic). La principal diferencia entre ambas consistió en la adición de un acoplad (es)
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| - Históricamente, la transmisión M4 Vacamatic de Chrysler, presentada en 1941, fue la primera transmisión semiautomática comercializada por un fabricante importante, en un intento de competir contra las transmisiones automáticas hidráulicas de sus rivales. El sistema todavía disponía de un pedal de embrague, aunque solo para poner el vehículo en marcha. En conducción normal, no era necesario emplear el embrague. Utilizaba una caja de cambios manual totalmente sincronizada, con cuatro marchas hacia adelante y una hacia atrás; en la que el cambio se realizaba 'automáticamente' ya fuese mediante cilindros de vacío (en la versión inicial M4) o bien mediante cilindros hidráulicos (en la versión posterior M6 Presto-Matic). La principal diferencia entre ambas consistió en la adición de un acoplador hidráulico entre el motor y el embrague en la M6, y en el mecanismo de cambio. (es)
- The 1941 M4 Vacamatic transmission by Chrysler was, historically, the first semi-automatic transmission which was marketed by a major manufacturer. It was an attempt to compete against rivals' hydraulic automatic transmissions, though it still had a clutch, primarily to change range. In normal driving, the clutch is not used. The transmission itself was a fully-synchronized manual transmission, with four forward gears, one reverse; where the shifting was done 'automatically' by either vacuum cylinders (early, M4), or hydraulic cylinders (late, M6, Presto-Matic). The main difference was the addition of a fluid coupling between engine and clutch, and the shifting mechanism. (en)
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