The Aisin AW50-40LM 4-speed automatic transmission was produced only from 1999 to 2003 and was installed in the Alfa Romeo 156 Q-System in conjunction with the 2.5-liter V6 engine only. This automatic transmission was also used for one year in the Lancia Lybra Comfortronic in conjunction with the 2.0-liter engine.
Specifications
| Type | automatic transmission |
| Number of gears | 4 |
| Type of drive | front |
| Engine volume, l | up to 2.5 |
| Torque output, Nm | up to 230 |
| Recommended oil | Toyota ATF Type T-IV |
| Oil capacity, liter | 7.2 |
| Partial replacement, liter | 3.5 |
| Maintenance | every 60 000 km |
| Gearbox lifespan, km | ~300 000 km |
| Weight, kg | 77 |
Gear ratios Aisin AW50-40LM
Using the example of a 2000 Alfa Romeo 156 with a 2.5 liter engine:
| Main | 2.86 |
| 1st | 3.90 |
| 2nd | 2.23 |
| 3rd | 1.48 |
| 4th | 1.06 |
| Reverse | 2.86 |
Using
The transmission was installed on:
- Alfa Romeo 156 (Type 932) in 1999 – 2003
- Lancia Lybra I (839) in 1999 – 2000
Disadvantages of the Aisin AW50-40LM gearbox
- This is a very reliable automatic transmission, and problems only occur at high mileage;
- Closer to 200,000 km, the torque converter lockup clutch usually wears out significantly;
- And its wear products clog the valve body, which is very sensitive to lubrication;
- If you drive for long periods with the transmission jerking, the oil pump bushing will break, causing leaks;
- Rarely, cracks in the Forward-Direct drum and brake band separation occur.
