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 MANUALSBUICK2010LUCERNE CXL, 3.9 1REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 21 (AUTOMATIC TRANSMISSION - 4T80-E - REPAIR INSTRUCTIONS - OFF VEHICLE)
2010 Buick Lucerne CXL, 3.9 1
Section 21 (Automatic Transmission - 4T80-E - Repair Instructions - Off Vehicle)
2010 Buick Lucerne CXL, 3.9 1SECTION Section 21 (Automatic Transmission - 4T80-E - Repair Instructions - Off Vehicle)
WARNING: This page is about a different variant/trim than selected.
- Repair Instructions - Off Vehicle
- Torque Converter and Oil Pump Drive Shaft Removal
- Holding Fixture Installation
- Vehicle Speed Sensor and Transmission Fluid Cooler Pipe Fitting Removal
- Fourth Servo Removal
- Final Drive End Play Measurement
- Case Extension and Scavenge Pipe Removal
- Front Differential Case Removal
- Output Shaft Removal
- Final Drive Carrier, Sun and Internal Gear Removal
- Fluid Pan, Gasket, and Transfer Oil Pump Inlet Screen Removal
- Lower Control Valve Body Assembly Removal
- Input Shaft End Play Measurement
- Auxiliary Control Valve Body Cover, Fluid Filter Seal, and Filter Removal
- Oil Pump, Upper Control Valve Assembly Removal
- Case Cover Removal
- Drive/Driven Sprocket and Chain Removal
- Input Speed Sensor and Wiring Harness Removal
- Second Clutch Plates and Reverse Clutch Removal
- 4th Band and Third Clutch/Reaction Shell Removal
- Park Pawl Removal
- Forward Clutch Plate Assembly and Low and Reverse Band Removal
- Manual Shift Detent Lever with Manual Shift Shaft Assembly Removal
- Case Inspection
- Drive Sprocket Support and Seal Replacement
- Forward and Coast Clutch Assembly Overhaul
- Low/Reverse Band and Fretting Ring Installation
- Forward and Coast Clutch Installation
- Final Drive Internal Gear and Snap Ring Installation
- Forward Clutch Support Stud Installation
- Parking Pawl and Pivot Pin Install
- 3rd Clutch Plate Assembly and Reaction Carrier Disassemble
- Third Clutch and Reaction Carrier Assemble
- Reaction Carrier/Shell and Third Clutch Installation
- 4th Band Installation
- Reverse Clutch Housing and Second Sprag Disassemble
- Reverse Clutch Housing and Second Sprag Assemble
- Reverse Clutch Housing Installation
- Second Clutch Plates Installation
- Clutch Air Check
- Driven Sprocket Support Disassemble
- Driven Sprocket Support Assemble
- Drive Sprocket, Driven Sprocket, and Drive Link and Assemble
- Thrust Bearings Installation
- Turbine Shaft Seal Replacement - Shaft to Case Cover
- Case Cover Assembly Installation
- Assembly End Play Measurement
- Control Valve Upper Body Disassemble
- Control Valve Upper Body Assemble
- Auxiliary Control Valve Body Assembly Installation
- Pump Disassemble
- Secondary Pump Disassemble
- Secondary Pump Assemble
- Pump Assemble
- Pump Installation
- Temperature Sensor, Torque Converter Clutch Solenoid Valve, and Pressure Control Solenoid Valve Assemble
- Oil Filter and Side Cover Install
- Channel Plate, Control Valve Body, and Accumulator Disassemble
- Control Valve Lower Body Disassemble
- Control Valve Lower Body Assemble
- Channel Plate Assemble
- Lower Control Valve Body and Internal Mode Switch Installation
- Accumulator Housing Disassemble
- Accumulator Housing Assemble
- Lower Controls Assembly Installation
- Manual Link and Wire Harness Connection
- Scavenge Screens/Seals, Bottom Pan Installation
- Final Drive Carrier Inspect
- Differential Carrier Overhaul
- Final Drive Carrier/Differential Carrier Install
- Output Shaft Installation
- Scavenge Pipe Installation
- Case Extension Install/Final Drive End Play Check
- Fourth Servo Overhaul
- Vehicle Speed Sensor and Transmission Fluid Cooler Pipe Fitting Installation
- Axle Seals Replacement
- Torque Converter and Oil Pump Drive Shaft Install
RENDER: 1.0x
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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.