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.
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HOMESERVICE MANUALSCHEVROLET2009IMPALA V6-3.9LREPAIR AND DIAGNOSISTRANSMISSION AND DRIVETRAINAUTOMATIC TRANSMISSION/TRANSAXLEEXTENSION HOUSINGSERVICE AND REPAIR
2009 Chevrolet Impala V6-3.9L
Extension Housing: Service and Repair
2009 Chevrolet Impala V6-3.9LSECTION Service and Repair
Case Extension Replacement
Removal Procedure
1. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection (RPO LS4) (Service and Repair)Battery Negative Cable Disconnection and Connection (RPOs LZE/LZ4/LZ8) (Service and Repair).
2. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle (Service and Repair).
3. Remove the right drive axle from the transaxle. Refer to Wheel Drive Shaft Replacement (Service and Repair).
4. Remove the transaxle brace. Refer to Transmission Brace Replacement (RPOs LZ9/LZE) (Transmission Brace Replacement)Transmission Brace Replacement (RPO LS4) (Transmission Brace Replacement)Transmission Brace Replacement (RPOs LZ9/LZE) (Transmission Brace Replacement).
5. Remove the vehicle speed sensor. Refer to Vehicle Speed Sensor Replacement (Service and Repair).
6. Remove the case extension housing bolts (5).
7. Remove the case extension housing (6) with the axle seal and the O-ring (8).
Installation Procedure
1. Install the O-ring (8) to the case extension housing (6).
2. Install the case extension housing (6) with the axle seal and the O-ring (8).
Caution: Refer to Fastener Caution (Fastener Caution).
3. Install the case extension housing bolts (5).
Tighten the bolts to 36 Nm (27 lb ft).
4. Install the vehicle speed sensor. Refer to Vehicle Speed Sensor Replacement (Service and Repair).
5. Install the transaxle brace. Refer to Transmission Brace Replacement (RPOs LZ9/LZE) (Transmission Brace Replacement)Transmission Brace Replacement (RPO LS4) (Transmission Brace Replacement)Transmission Brace Replacement (RPOs LZ9/LZE) (Transmission Brace Replacement).
6. Install the right drive axle to the transaxle. Refer to Wheel Drive Shaft Replacement (Service and Repair).
7. Lower the vehicle.
8. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection (RPO LS4) (Service and Repair)Battery Negative Cable Disconnection and Connection (RPOs LZE/LZ4/LZ8) (Service and Repair).
Caution: Do NOT overfill the transaxle. The overfilling of the transaxle causes foaming, loss of fluid, shift complaints, and possible damage to the transaxle.
9. Check and fill the transaxle as necessary.
10. Inspect for fluid leaks.
RENDER: 1.0x
NO RELATED
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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.