A sub transmission for automotive transmission mechanics is an extra manual or

automatic transmission An automatic transmission (sometimes abbreviated to auto or AT) is a multi-speed transmission used in internal combustion engine-based motor vehicles that does not require any input from the driver to change forward gears under normal driving ...

that is independent of the main transmission. In a

four-wheel drive Four-wheel drive, also called 4×4 ("four by four") or 4WD, refers to a two-axled vehicle drivetrain capable of providing torque to all of its wheels simultaneously. It may be full-time or on-demand, and is typically linked via a transfer cas ...

, an extra gear stick is often provided to transfer torque when needed and to put the vehicle into low range. Sub transmissions are used in a few

motorcycle A motorcycle (motorbike, bike, or trike (if three-wheeled)) is a two or three-wheeled motor vehicle steered by a handlebar. Motorcycle design varies greatly to suit a range of different purposes: long-distance travel, commuting, cruising ...

s, such as the Honda CB900C and the Honda CT110. In the

Mitsubishi Cordia The Mitsubishi Cordia is a compact hatchback- coupé manufactured by Mitsubishi Motors between 1982 and 1990. Alongside the Tredia and Starion, the Cordia is one of the first cars imported and sold in the United States by Mitsubishi without t ...

, a " Super Shift 4x2" sub transmission was adopted, doubling the number of 4-speed main transmission gears.

References

Automotive transmission technologies Gears {{car-stub