Getrag F28/6 transmission
The Getrag F28/6 is a 6-speed manual transmission built by Getrag and fitted to the C20LET 2.0L Turbo Opel Calibra.
Features
The F28/6 was designed to follow a transverse oriented C20LET engine feeding the front wheels with an outlet to facilitate a driveshaft to feed the rear wheels as well. If the four-wheel drive system is disengaged, the gearbox feeds the front wheels. Conversion kits are available from aftermarket suppliers to convert the 6-speed transmission to suit a front-wheel drive vehicle, and this is a common upgrade amongst owners of the C20XE and X20XEV Calibras.| Clutch diameter | |
| 1st gear ratio | 3.57:1 |
| 2nd gear ratio | 2.16:1 |
| 3rd gear ratio | 1.45:1 |
| 4th gear ratio | 1.10:1 |
| 5th gear ratio | 0.89:1 |
| 6th gear ratio | 0.74:1 |
| Reverse gear ratio | 3.23:1 |
| Final drive ratio | 3.72:1 3.70:1 |
Designation
One interpretation of Opel's gearbox numbering designation is that it refers to the ft·lbf torque capacity, in this case a torque limit. Instead it may be related to the engine size.GM transmissions are usually numerically designated in Newton-meters. For example the 6-speed M32 gearbox was fitted to the Opel/Vauxhall Astra VXR H and has a torque rating of . The maximum torque output of the Astra VXR engine is limited to.