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1. DUAL CLUTCH TRANSMISSION TRUCK DRIVERS
2. DUAL CLUTCH TRANSMISSION TRUCK DRIVER
3. DUAL CLUTCH TRANSMISSION TRUCK MANUAL

Advertising proclaimed it "the greatest advance since the self-starter." Oldsmobile was chosen to introduce the Hydra-Matic for two reasons: economies of scale-Oldsmobile produced more cars than Cadillac and Buick at the time, thus providing a better test base-and to protect the reputation of Cadillac and Buick in case of a market failure of the new transmission. The first Oldsmobiles so equipped were shipped in October 1939 in the Oldsmobile Series 60 and the Oldsmobile Series 70. The result, dubbed " Hydra-Matic Drive," went into production in May 1939 for the 1940 model year. There was no separate Park position as found with modern transmissions. (In this way, it was less sophisticated than the 1924 Vulcan (Vulcan-Werke Hamburg und Stettin) prototype, which had a torque converter.) It incorporated a parking pawl which was engaged when the shift selector was placed in reverse with the engine off. The transmission would have four forward speeds (3.82:1, 2.63:1, 1.45:1, and 1.00:1) plus reverse, with all acceleration provided by gearing its fluid coupling did not multiply the engine output as a torque converter does. The HydraMatic was designed to combine the hydraulic operation of a planetary gearbox (allowing much shifting to be automated) with a fluid coupling instead of a friction clutch, eliminating the need for de-clutching. Oldsmobile offered the AST from 1937-1939, while Buick offered it only in 1938.

DUAL CLUTCH TRANSMISSION TRUCK DRIVER

The AST was a semi-automatic transmission using planetary gears and conventional friction clutch, requiring the driver to use the clutch to shift into or out of gear, but not between the two forward gears. The Automatic Safety Transmission (AST) was a tangent outgrowth of this work. This same group of engineers was then moved into the General Motors Research Laboratory, building pilot transmission units during 1935-36 which were then handed to Oldsmobile for testing. During 1934, the Cadillac transmission group had developed a step-ratio gearbox that would shift automatically under full torque. Ĭadillac, under Thompson, began working on a 'shiftless' transmission in 1932, and a new department within Cadillac Engineering was created, headed by Thompson and including engineers Ernest Seaholm, Ed Cole, Owen Nacker, and Oliver Kelley.

Thompson and introduced in the autumn of 1928.

DUAL CLUTCH TRANSMISSION TRUCK MANUAL

The exception here was Cadillac's break-through synchromesh fully synchronized manual transmission, designed by Cadillac engineer Earl A.

DUAL CLUTCH TRANSMISSION TRUCK DRIVERS

At the time, synchronized gear shifting was still a novelty (and confined to higher gears in most cases), and shifting a manual gearbox required more effort than most drivers cared to exert. Introduced in 1939 for the 1940 model year vehicles, the Hydramatic was the first mass-produced fully-automatic transmission developed for passenger automobile use.ĭuring the 1930s, automakers sought to reduce or eliminate the need to shift gears. Hydramatic (also known as Hydra-Matic) is an automatic transmission developed by both General Motors' Cadillac and Oldsmobile divisions.

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