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  2. Gear oil - Wikipedia

    en.wikipedia.org/wiki/Gear_oil

    GL-5 is not necessarily backward-compatible in synchro-mesh transmissions which are designed for a GL-4 oil: GL-5 has a lower coefficient of friction due to the higher concentration of EP additives over GL-4, and thus synchros can not engage as effectively, unless a specialized friction modifier has been included within the oil's additive ...

  3. Non-synchronous transmission - Wikipedia

    en.wikipedia.org/wiki/Non-synchronous_transmission

    Three-speed sliding-gear non-synchronous transmission Non-synchronous "crash" gearbox; commonly used today in semi-trucks and tractors, and formerly used in automobiles pre-1950s. A non-synchronous transmission, also called a crash gearbox, is a form of manual transmission based on gears that do not use synchronizing mechanisms. They require ...

  4. Manual transmission - Wikipedia

    en.wikipedia.org/wiki/Manual_transmission

    Top and side view of a typical manual transmission, in this case, a Ford Toploader, used in vehicles with external floor shifters. The first car to use a manual transmission with synchromesh was the 1929 Cadillac. [5] Most North American marques had adopted synchronized manual transmissions, usually for second and high gears, by the mid-1930s.

  5. Muncie SM465 transmission - Wikipedia

    en.wikipedia.org/wiki/Muncie_SM465_transmission

    The Synchro-mesh 465 or SM465 is a heavy-duty, four-speed manual transmission built by General Motors for use in light and medium duty trucks from 1968 to 1991 at the factory in Muncie, Indiana; it was designed to replace the somewhat similar Muncie SM420 transmission, which had been in production since just after World War II.

  6. Afton Chemical - Wikipedia

    en.wikipedia.org/wiki/Afton_Chemical

    The Ashland Technical Center is the R&D site for vehicle-based research used by all strategic business units that manufacture automotive additives, including engine oil, fuel, transmission and axle. The center is used for research into durability, fuel economy, emissions, and new-product development. [ 9 ]

  7. Synchro - Wikipedia

    en.wikipedia.org/wiki/Synchro

    A synchro transmitter's shaft is rotated by the mechanism that sends information, while the synchro receiver's shaft rotates a dial, or operates a light mechanical load. Single and three-phase units are common in use, and will follow the other's rotation when connected properly.