The GM AF40 6-speed automatic transmission was produced in Japan from 2004 to 2019 and installed in many front-wheel drive and all-wheel drive General Motors models. This automatic transmission was essentially a variant of the popular Aisin TF-80SC.
Specifications
| Type | automatic transmission |
| Number of gears | 6 |
| Type of drive | front / all wheel |
| Engine volume, l | up to 3.6 |
| Torque output, Nm | up to 450 |
| Recommended oil | 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 | 87 |
Gear ratios GM AF40
Using the 2007 Opel Signum with a 2.8 V6 Turbo engine as an example:
| Main | 3.200 |
| 1st | 4.148 |
| 2nd | 2.369 |
| 3rd | 1.556 |
| 4th | 1.155 |
| 5th | 0.859 |
| 6th | 0.686 |
| Reverse | 3.394 |
Using
The transmission was installed on:
- Cadillac BLS 1 (GM-E) in 2005 – 2010;
- Cadillac SRX II (GMT267) in 2009 – 2016;
- Chevrolet Cruze 1 (J300) in 2008 – 2016;
- Opel Astra H (A04) in 2005 – 2010; Astra J (P10) in 2009 – 2015;
- Opel Cascada A (W13) in 2013 – 2015;
- Opel Insignia A (G09) in 2008 – 2017;
- Opel Signum A (Z03) in 2004 – 2008;
- Opel Vectra C (Z02) in 2004 – 2008;
- Opel Zafira B (A05) in 2005 – 2010; Zafira C (P12) in 2011 – 2019;
- Opel Meriva B (S10) in 2010 – 2017;
- Saab 9-3 II (YS3F) in 2006 – 2014;
- Saab 9-5 II (YS3G) in 2010 – 2012.
Disadvantages of the GM AF40 gearbox
- This is a fairly robust automatic transmission, but it is installed with very powerful engines;
- And therefore, active owners quickly wear out the torque converter lockup clutch;
- Then dirt gets into the channels and solenoids of the valve body, and the automatic transmission begins to struggle;
- The transmission’s weak point is the small heat exchanger: it quickly clogs;
- This leads to overheating, wear of the Teflon rings, and reduced lubrication pressure;
