The 5-speed automatic Aisin AW55-50SN was produced at a plant in Japan from 1999 to 2014 and was installed on many popular models of General Motors, Volvo, and Renault under the index SU1. On the market, this gearbox is best known for Opel cars under its index AF23 and AF33.
Specifications
| Production years | 1999-2014 |
| Type | automatic transmission |
| Number of gears | 5 |
| Type of drive | front / all wheel |
| Engine volume, l | up to 3.5 |
| Torque output, Nm | up to 330 |
| Recommended oil | Toyota ATF Type T-IV (since 2006 Toyota ATF WS) |
| Oil capacity, liter | 7.2 |
| Partial replacement, liter | 3.5 |
| Replacing the filter | every 60 000 km |
| Gearbox lifespan, km | ~300 000 |
| Weight, kg | 90 |
Gear ratios Aisin AW55-50SN
Using the example of a 2005 Volvo S40 with a 2.4 liter engine:
| Main | 2.44 |
| 1st | 4.66 |
| 2nd | 3.03 |
| 3rd | 1.98 |
| 4th | 1.34 |
| 5th | 1.02 |
| Reverse | 5.11 |
Using
The transmission was installed on:
- Alfa Romeo 166 (Type 936);
- Cadillac (as FA57) BLS 1 (GM-E);
- Fiat Croma II (194);
- Lancia Thesis I (841);
- Nissan (as RE5F22A) Altima 3 (L31), Maxima 6 (A34), Quest 3 (V42);
- Opel (as AF23 and AF33) Signum A (Z03), Vectra C (Z02);
- Renault (as SU1) Avantime 1 (D66), Espace 4 (J81), Laguna 2 (X74), Vel Satis 1 (B73);
- Saab (as FA57) 9-3 II (YS3F), 9-5 I (YS3E);
- Saturn Ion 1 (GMX357);
- Volvo C30 I (533), C70 I (872), C70 II (542), S40 I (644), S40 II (544), S60 I (384), V40 I (645), V50 I (545), V70 I (875), V70 II (285), S70 I (874), S80 I (184), XC70 I (876), XC70 II (295), XC90 I (275).
Disadvantages of the Aisin AW55-50SN gearbox
- This is a strong Japanese automatic transmission, but in the first automatic transmissions they could give the owner trouble.
- The first years the hydraulic unit did not serve much and there were cases of antifreeze getting into the lubricant.
- Closer to 2004, all the weak points were fixed and the gearbox resource increased to 300 thousand km.
- At high mileage, the hydraulic unit may become clogged with wear products from the torque converter clutch.
- Then the oil pump bushing usually breaks and noticeable oil leaks appear.
