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.
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It was a 5 speed transmission with the following configuration:
Clutch Diameter 9.0 inches (230 mm)
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.