The Getrag F20 5-speed manual transmission
was fitted to many vehicles in the European General Motors
production line up including the Opel Calibra, Vectra A, Astra F & Kadett E. It was a 5 speed transmission with the following configuration:
Clutch Diameter <br />1st Gear Ratio 3.55:1 <br />2nd Gear Ratio 2.16:1 <br />3rd Gear Ratio 1.48:1 <br />4th Gear Ratio 1.13:1 <br />5th Gear Ratio 0.89:1<br />Reverse Gear Ratio 3.33:1 <br />Final Drive Ratio 3.55:1. 3.42:1 or 3.72:1 found in 4WD F20's.
There are two types of flywheel, depending on the manufacturing year. Kadett's 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 is cable-driven, and has a big fork on the outside-top part of the housing. It has a cover in the bell housing that lets you change the clutch disc without taking off the gearbox.It has a lot of similarities with the Getrag F16 Gearbox, that has a weaker main shaft. It has also a lot of similarities with the Daewoo D16 and D20 Gearboxes.
There have been many references to the numbering designation that Opel
elected to utilise for gearboxes, one of the more common arguments is that it refers to the ft·lbf torque 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... Read More