Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Section 1 (40/41TE Automatic Transmission (Service Information)): Description: Description: Notes
| 1 - TRANSAXLE CASE | 7 - REVERSE CLUTCH | 13 - OUTPUT SHAFT GEAR |
| 2 - TORQUE CONVERTER | 8 - FRONT PLANET CARRIER | 14 - TRANSFER SHAFT GEAR |
| 3 - OIL PUMP | 9 - 2/4 CLUTCH | 15 - TRANSFER SHAFT |
| 4 - INPUT SPEED SENSOR | 10 - L/R CLUTCH | 16 - DIFFERENTIAL |
| 5 - UNDERDRIVE CLUTCH | 11 - OUTPUT SPEED SENSOR | 17 - CONVERTER DRIVE PLATE |
| 6 - OVERDRIVE CLUTCH | 12 - REAR PLANET CARRIER/OUTPUT SHAFT | 18 - INPUT SHAFT |
The 40TE is a four-speed transaxle that is a conventional hydraulic/mechanical assembly with an integral differential, and is controlled with adaptive electronic controls and monitors. Refer to Fig 1. The hydraulic system of the transaxle consists of the transaxle fluid, fluid passages, hydraulic valves, and various line pressure control components. An input clutch assembly which houses the underdrive, overdrive, and reverse clutches is used. It also utilizes separate holding clutches: 2nd/4th gear and Low/Reverse. The primary mechanical components of the transaxle consist of the following:
- Three multiple disc input clutches
- Two multiple disc holding clutches
- Four hydraulic accumulators
- Two planetary gear sets
- Hydraulic oil pump
- Valve body
- Solenoid/Pressure switch assembly
- Integral differential assembly
Control of the transaxle is accomplished by fully adaptive electronics. Optimum shift scheduling is accomplished through continuous real-time sensor feedback information provided to the Powertrain Control Module (PCM) or Transmission Control Module (TCM).
The PCM/TCM is the heart of the electronic control system and relies on information from various direct and indirect inputs (sensors, switches, etc.) to determine driver demand and vehicle operating conditions. With this information, the PCM/TCM can calculate and perform timely and quality shifts through various output or control devices (solenoid pack, transmission control relay, etc.).
The PCM/TCM also performs certain self-diagnostic functions and provides comprehensive information (sensor data, DTC's, etc.) which is helpful in proper diagnosis and repair. This information can be viewed with a scan tool.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.