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Blueprint: Subaru Legacy and Outback 6-Speed Manual Transmission

Subaru enhances the fun-to-drive nature of 2010 Legacy and Outback models by equipping them with a standard 6-speed manual transmission. Compact, quiet, and lightweight, it helps to improve performance and fuel economy.


The standard 6-speed manual transmission is featured in certain Legacy 2.5i and 2.5GT models and Outback 2.5i models. Among the 6-speed transmission's highlights are its hydraulic clutch, dual-mass flywheel, cable shifter with integrated reverse lock-out, and gear indicator display incorporated in the instrument panel.


Clutch and Flywheel


Subaru chose to equip Legacy and Outback with a hydraulic clutch and dual-mass flywheel. They both contribute to smooth, comfortable shifting.


The hydraulic (rather than mechanical) clutch lends consistency to clutch operation by having the same feel each time it's used. In addition, pedal effort is less than it would be for a mechanical clutch.


The dual-mass (two-mass) flywheel has two rotating halves. One half is connected to the engine crankshaft, and the other connects to the first through a system of damper springs. The springs allow a small degree of twisting rotation between the halves, which better absorbs the shock of engaging the clutch. The dual-mass system allows the clutch disc to be lighter and simpler, which also reduces the exertion required to operate the clutch, thereby contributing to driver comfort.


Internal Components


The 6-speed manual transmission is approximately the same length as the Subaru 5-speed manual. Subaru developed the 6-speed's efficient packaging by optimizing gear placement and the shift link mechanism. Wherever possible, the 6-speed shares its parts with the 5-speed manual transmission, which helps reduce manufacturing costs (and the resultant cost of ownership!).


Synchromesh materials were upgraded for this transmission. The use of carbon for first, second, and reverse gears results in smoother gear changes and improved mechanical refinement. The use of helical gears for reverse adds to that refinement. The potential for wear has been reduced by using double synchromeshes on first and second gears as well as through added honing of second and third gears.


In addition, the transmission's design reduces friction loss by optimizing lubrication paths. That contributes to improved fuel economy.

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