The Opel AF23 5-speed automatic transmission was produced in Japan from 2002 to 2008 and was installed in the third-generation Vectra and the similar Signum with the Z22SE and Z22YH engines. This automatic transmission is known by its own designation, the AW55-50SN, in Aisin’s classification.
Specifications
| Type | automatic transmission |
| Number of gears | 5 |
| Type of drive | front |
| Engine volume, l | up to 2.2 |
| Torque output, Nm | up to 220 |
| Recommended oil | Toyota ATF Type T-IV since 2006 Toyota ATF WS |
| Oil capacity, liter | 7.2 |
| Partial replacement, liter | 3.5 |
| Maintenance | every 60 000 km |
| Gearbox lifespan, km | ~300 000 km |
| Weight, kg | 86 |
Gear ratios Opel AF23
Using the example of a 2005 Opel Signum with a 2.2-liter engine:
| Main | 2.60 |
| 1st | 4.685 |
| 2nd | 2.942 |
| 3rd | 1.923 |
| 4th | 1.301 |
| 5th | 1.000 |
| Reverse | 3.177 |
Using
The transmission was installed on:
- Opel Signum A (Z03) in 2003 – 2008
- Opel Vectra C (Z02) in 2002 – 2008
Disadvantages of the Opel AF23 gearbox
- This is a very reliable Japanese automatic transmission, but it could present problems in the early years;
- The first transmissions suffered from antifreeze contamination of the oil and short valve body life;
- By 2004, the weak points had been corrected, and the transmissions were able to easily last 300,000 km;
- At high mileage, the valve body often becomes clogged with wear debris from the torque converter clutch;
- In the most severe cases, the oil pump bushing breaks, causing leaks.
