Overhaul Procedure Steps

NOTE: This article lists the sequential steps necessary to overhaul the transmission.
^ For the specific step listed below, refer to that step under "Repair Instructions".
Repair Instructions


1. Torque Converter Removal and Holding Fixture Installation
2. Case Extension Assembly Removal
3. Transmission Fluid Pan, Filter and Electrical Connector Passage Sleeve Removal (6L80)
4. Control Valve Body Assembly Removal
5. Torque Converter Housing with Fluid Pump Removal
6. 1-2-3-4 and 3-5 Reverse Clutch Assembly and 4-5-6 Clutch Assembly Removal (6L50/80/90)
7. Center Support, Output Carrier and Output Shaft Removal (6L80/6L90)
8. Manual Shift Shaft and Parking System Components Overhaul (6L80/6L90)
9. Manual Shift Shaft Seal Replacement
10. Output Shaft Seal Replacement (AWD Models Only)
11. Case Inspection
12. Output Shaft Disassemble (6L80/6L90)
13. Output Internal Gear Disassemble (6L80/6L90)
14. Output Shaft Assemble (6L80/6L90)
15. Output Carrier Assembly Overhaul (6L80)
16. Output Carrier Assembly Overhaul (6L90)
17. Output Carrier to Output Shaft Assemble (6L80/6L90)
18. Output Carrier to Output Internal Gear Assemble (6L80/6L90)
19. 2-6 Clutch Overhaul (6L80)
20. 2-6 Clutch Overhaul (6L90)
21. Low and Reverse Clutch Overhaul (6L80)
22. Low and Reverse Clutch Overhaul (6L90)
23. Low and Reverse Clutch Backing Plate Retaining Ring Measurement
24. 4-5-6 Clutch Dampener Overhaul (6L50/80/90)
25. 4-5-6 Clutch Overhaul (6L80/6L90)
26. 4-5-6 Clutch Backing Plate Retaining Ring Measurement
27. 1-2-3-4 and 3-5 Reverse Clutch Overhaul (6L50/6L80/6L90)
28. 1-2-3-4 Clutch Backing Plate Retaining Ring Measurement
29. 3-5 Reverse Clutch Backing Plate Retaining Ring Measurement (6L80/6L90)
30. Torque Converter Housing with Fluid Pump Disassemble
31. Fluid Pump Cover Cleaning and Inspection
32. 1-2-3-4 and 3-5 Reverse Clutch Fluid Seal Ring Installation (6L80/6L90)
33. Torque Converter Housing Cleaning and Inspection
34. Torque Converter Fluid Seal Replacement
35. Transmission Fluid Cooler Pipe Seal Replacement
36. Fluid Pump Selective Measurement
37. Torque Converter Housing with Fluid Pump Assemble
38. Fluid Pump Cover Installation
39. Control Valve Body Assembly Disassemble
40. Control Valve Lower Body Assembly Cleaning and Inspection
41. Control Valve Upper Body Assembly Cleaning and Inspection
42. Control Valve Body Assembly Assemble
43. Center Support, Output Carrier and Output Shaft Installation (6L80/6L90)
44. 1-2-3-4 and 3-5 Reverse Clutch Assembly and 4-5-6 Clutch Assembly Installation (6L80/6L90)
45. Torque Converter Housing with Fluid Pump Installation
46. Propeller Shaft Front Slip Yoke Oil Seal Replacement
47. Control Valve Body Assembly Installation
48. Automatic Transmission Electrical Connector Passage Sleeve Installation
49. Fluid Filter and Manual Shift Detent Assembly Installation
50.Transmission Fluid Pan Installation (6L80)
52. Case Extension Assembly Installation
53. Torque Converter Installation and Holding Fixture Removal