The General Motors 4L65E (or M32) 4-speed automatic transmission was produced from 2001 to 2007 and was installed in particularly large and powerful models with V8 engines up to 6.0 liters. This automatic transmission is known from the Hummer H2, Cadillac Escalade, Chevrolet Silverado, and GMC Yukon.
Specifications
| Type | automatic transmission |
| Number of gears | 4 |
| Type of drive | rear / all wheel |
| Engine volume, l | up to 6.0 |
| Torque output, Nm | up to 515 |
| Recommended oil | ATF Dexron VI |
| Oil capacity, liter | 10.6 |
| Partial replacement, liter | 5.7 |
| Maintenance | every 80 000 km |
| Gearbox lifespan, km | ~350 000 km |
| Weight, kg | 81 |
Gear ratios GM 4L65E
Using the example of a 2005 Hummer H2 with a 6.0 liter engine:
| Main | 4.1 |
| 1st | 3.059 |
| 2nd | 1.625 |
| 3rd | 1.000 |
| 4th | 0.696 |
| Reverse | 2.294 |
Using
The transmission was installed on:
- Cadillac Escalade 2 (GMT820) in 2001 – 2006;
- Chevrolet Corvette C6 (GMX245) in 2004 – 2005;
- Chevrolet Silverado 1 (GMT800) in 2003 – 2007;
- GMC Sierra 2 (GMT800) in 2002 – 2007;
- GMC Yukon 2 (GMT820) in 2001 – 2006;
- Hummer H2 (GMT820) in 2004 – 2007;
- Pontiac GTO 5 (GMX281) in 2004 – 2006.
Disadvantages of the GM 4L65 gearbox
- This automatic transmission is installed in large, powerful vehicles, and the torque converter clutch wears out quickly;
- Then wear debris clogs the solenoids, and the oil pressure in the system drops;
- The drop in pressure reduces the life of the clutches, and the 3-4 gear pack is the first to burn out;
- At high mileage, the reverse gear drum and brake band are often replaced;
- Also, the petal-type oil pump does not like long-term driving at high speeds.
