There are two fundamental types of motor vehicle transmission:
Furthermore, they may also be manufactured solely as a gearbox, and use an entirely separate final drive unit (including its differential) – or be supplied as a transaxle, which includes both the gearbox and final drive unit within one housing.
The first variant, the 7DT-45 – used in the 911 Carrera, the 2009 997 Carrera and Carrera S models; the 2009 Cayman and Boxster, along with a higher torque version, the 7DT-70 in the 2010 911 Turbo.
These are for heavy motor vehicles; such as large goods vehicles (trucks), buses, motorcoaches, agricultural machinery, plant equipment (such as earth movers), or specialist military vehicles such as tanks.
This section needs expansion. You can help by adding to it. (November 2009)
TD: Truck application with direct-drive final gear ratio
TO: Truck application with over-drive final gear ratio
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