The General Motors 4T40E (or MN4) 4-speed automatic transmission was produced from 1994 to 2005 and was installed with both 4-cylinder and V6 engines up to 3.1 liters. In some countries, this automatic transmission is known as the Chevrolet Malibu, Pontiac Sunfire, and many Daewoo models.
Specifications
| Type | automatic transmission |
| Number of gears | 4 |
| Type of drive | front |
| Engine volume, l | up to 3.1 |
| Torque output, Nm | up to 258 |
| Recommended oil | ATF Dexron VI |
| Oil capacity, liter | 12.2 |
| Partial replacement, liter | 6.5 without removing the pallet 8.5 with removing the pallet |
| Maintenance | every 80 000 km |
| Gearbox lifespan, km | ~350 000 km |
| Weight, kg | 77 |
Gear ratios GM 4T40
Using the example of a 1999 Chevrolet Malibu with a 2.4 liter engine:
| Main | 3.42 |
| 1st | 2.960 |
| 2nd | 1.626 |
| 3rd | 1.000 |
| 4th | 0.681 |
| Reverse | 2.130 |
Using
The transmission was installed on:
- Chevrolet Cavalier 3 in 1994 – 2005;
- Chevrolet Corsica 1 in 1994 – 1996;
- Chevrolet Malibu 5 (GMX130) in 1996 – 2003;
- Daewoo Cielo 1 in 1995 – 2005;
- Daewoo Nubira 1 (J100) in 1998 – 2002;
- Daewoo Lanos 1 (T100) in 1998 – 2002;
- Oldsmobile Alero 1 (GMX130) in 1998 – 2004;
- Pontiac Grand Am 5 (GMX130) in 1998 – 2005;
- Pontiac Sunfire 1 in 1994 – 2005;
- Saturn L-series 1 (GM2900) in 1999 – 2004.
Disadvantages of the GM 4T40 gearbox
- This is a very reliable and durable automatic transmission with a service life of over 300,000 km;
- However, it is extremely important to monitor for oil leaks, which occur regularly;
- Also, many failures are caused by damaged wiring or electrical connectors;
- All other problems are caused by contamination of the solenoids by wear products;
- When combined with V6 engines, the torque converter lockup clutch wears out very quickly.
