The Getrag F20 5-speed manual transmission was fitted to many vehicles in the European General Motors production line up including for the UK the

Vauxhall Astra The Vauxhall Astra is a compact car/ small family car ( C-segment) that has been sold by Vauxhall since 1980. It is currently produced at Ellesmere Port, Cheshire, England. For its first two generations, the nameplate was applied to right- ...

DOHC 2.0i GTE 16 valve,

Vauxhall Cavalier The Vauxhall Cavalier was a large family car that was sold primarily in the UK by Vauxhall from 1975 to 1995. It was based on a succession of Opel designs throughout its production life, during which it was built in three incarnations. The fir ...

GSi 2000 16 valve DOHC and

Vauxhall Calibra The Opel Calibra is a coupé, engineered and produced by the German automaker Opel between 1989 and 1997. In the United Kingdom, where it remained on sale until 1999, it was marketed under the Vauxhall brand as the Vauxhall Calibra. It was also ...

2.0i 16 valve

DOHC An overhead camshaft (OHC) engine is a piston engine where the camshaft is located in the cylinder head above the combustion chamber. This contrasts with earlier overhead valve engines (OHV), where the camshaft is located below the combustion ch ...

. Everywhere else under the Opel brand name the Calibra, Vectra A,

Astra Astra may refer to: People * Astra (name) Places * Astra, Chubut, a village in Argentina * Astra (Isauria), a town of ancient Isauria, now in Turkey * Astra, one suggested name for a hypothetical fifth planet that became the asteroid belt Ent ...

F &

Kadett Kadett corresponds to Cadet in English and is a term used in Sweden to denote officer candidates studying in order to become an officer. There are basically two ways to become officer as described below. Specialist Officers (SO) Direct recruitment ...

E. It was a 5 speed transmission with the following specifications: Clutch Diameter
1st Gear Ratio 3.55:1
2nd Gear Ratio 2.16:1
3rd Gear Ratio 1.48:1
4th Gear Ratio 1.13:1
5th Gear Ratio 0.89:1
Reverse Gear Ratio 3.33:1
Final Drive Ratio 3.55:1. 3.42:1 or 3.72:1 found in 4WD F20's. There are two types of

flywheel A flywheel is a mechanical device which uses the conservation of angular momentum to store rotational energy; a form of kinetic energy proportional to the product of its moment of inertia and the square of its rotational speed. In particular, assu ...

, depending on the manufacturing year. Kadetts had "Flat" flywheels, which are lighter, while Astras, Vectras and Calibras had "Pot" flywheels, which are heavier to make a more comfortable ride. The

clutch A clutch is a mechanical device that engages and disengages power transmission, especially from a drive shaft to a driven shaft. In the simplest application, clutches connect and disconnect two rotating shafts (drive shafts or line shafts ...

is cable-driven, and has a big fork on the outside-top part of the housing. It has a cover in the

bell housing Bell housing or bellhousing is a colloquial/slang term for the portion of the transmission that covers the flywheel and the clutch or torque converter of the transmission on vehicles powered by internal combustion engines. This housing is bol ...

that lets you change the clutch disc without taking off the

gearbox Propulsion transmission is the mode of transmitting and controlling propulsion power of a machine. The term ''transmission'' properly refers to the whole drivetrain, including clutch, gearbox, prop shaft (for rear-wheel drive vehicles), diffe ...

. It has a lot of similarities with the Getrag F16 Gearbox, that has a weaker main shaft. It also has a lot of similarities with the Daewoo D16 and D20 Gearboxes. There have been many references to the numbering designation that

Opel Opel Automobile GmbH (), usually shortened to Opel, is a German automobile manufacturer which has been a subsidiary of Stellantis since 16 January 2021. It was owned by the American automaker General Motors from 1929 until 2017 and the PSA ...

elected to utilise for gearboxes, one of the more common arguments is that it refers to the ft·lbf

torque In physics and mechanics, torque is the rotational equivalent of linear force. It is also referred to as the moment of force (also abbreviated to moment). It represents the capability of a force to produce change in the rotational motion of t ...

capacity of the gearbox, in this case being a torque limit. Other arguments include that it is simply related to the engine size (the F20 gearbox was often fitted to 2.0L engine vehicles and the F16 gearbox usually was fitted to 1.6 or 1.8l size engines. ) As an example the F20 transmission was fitted to the Opel Calibra, Vectra A, Astra F & Kadett E with C20XE 2.0l 16V Engines.

References

General Motors transmissions Getrag transmissions {{Getrag