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

6L45/6L50/6L80/6L90 - Automatic Transmission

1. Torque Converter Removal and Holding Fixture Installation (6L90)
2. Torque Converter Removal and Holding Fixture Installation (6L45)
3. Propeller Shaft Transmission Flange Removal (6L90)
4. Propeller Shaft Transmission Flange Removal (6L45)
5. Case Extension Assembly Removal (6L45)
6. Transmission Fluid Pan, Filter and Electrical Connector Passage Sleeve Removal (6L90)
7. Transmission Fluid Pan, Filter and Electrical Connector Passage Sleeve Removal (6L45)
8. Control Valve Body Assembly Removal
9. Torque Converter Housing with Fluid Pump Removal (6L90)
10. Torque Converter Housing with Fluid Pump Removal (6L45)
11. 1-2-3-4 and 3-5 Reverse Clutch Assembly and 4-5-6 Clutch Assembly Removal (6L50/80/90)
12. 1-2-3-4 and 3-5 Reverse Clutch Assembly and 4-5-6 Clutch Assembly Removal (6L45)
13. Center Support, Output Carrier and Output Shaft Removal (6L90)
14. Center Support, Output Carrier and Output Shaft Removal (6L45)
15. Manual Shift Shaft and Parking System Components Overhaul (6L80/6L90)
16. Manual Shift Shaft and Parking System Components Overhaul (6L45/6L50)
17. Manual Shift Shaft Seal Replacement
18. Output Shaft Seal Replacement (AWD Models Only)
19. Output Shaft Bearing Replacement - Case (6L45)
20. Case Inspection
21. Output Shaft Disassemble (6L45)
22. Output Shaft Disassemble (6L50/80/90)
23. Output Internal Gear Disassemble (6L80/6L90)
24. Output Shaft Assemble (6L45)
25. Output Shaft Assemble (6L50/80/90)
26. Output Carrier Assembly Overhaul (6L90)
27. Output Carrier Assembly Overhaul (6L45)
28. Output Carrier to Output Shaft Assemble (6L90)
29. Output Carrier to Output Shaft Assemble (6L45)
30. Output Carrier to Output Internal Gear Assemble (6L80/6L90)
31. 2-6 Clutch Overhaul (6L90)
32. 2-6 Clutch Overhaul (6L45)
33. 2-6 Clutch Backing Plate Retaining Ring Measurement (6L45/50)
34. Low and Reverse Clutch Overhaul (6L90)
35. Low and Reverse Clutch Overhaul (6L45)
36. Low and Reverse Clutch Backing Plate Retaining Ring Measurement
37. 4-5-6 Clutch Dampener Overhaul (6L50/80/90)
38. 4-5-6 Clutch Overhaul (6L80/6L90)
39. 4-5-6 Clutch Overhaul (6L45/6L50)
40. 4-5-6 Clutch Backing Plate Retaining Ring Measurement
41. 1-2-3-4 and 3-5 Reverse Clutch Overhaul (6L45)
42. 1-2-3-4 and 3-5 Reverse Clutch Overhaul (6L45/6L50/6L80/6L90)
43. 1-2-3-4 Clutch Backing Plate Retaining Ring Measurement
44. 3-5 Reverse Clutch Backing Plate Retaining Ring Measurement (6L80/6L90)
45. 3-5 Reverse Clutch Backing Plate Retaining Ring Measurement (6L45/6L50)
46. Torque Converter Housing with Fluid Pump Disassemble
47. Fluid Pump Cover Cleaning and Inspection
48. 1-2-3-4 and 3-5 Reverse Clutch Fluid Seal Ring Installation (6L45/6L50)
49. 1-2-3-4 and 3-5 Reverse Clutch Fluid Seal Ring Installation (6L80/6L90)
50. Torque Converter Housing Cleaning and Inspection
51. Torque Converter Fluid Seal Replacement
52. Transmission Fluid Cooler Pipe Seal Replacement
53. Fluid Pump Selective Measurement
54. Torque Converter Housing with Fluid Pump Assemble
55. Fluid Pump Cover Installation
56. Control Valve Body Assembly Disassemble
57. Control Valve Lower Body Assembly Cleaning and Inspection
58. Control Valve Upper Body Assembly Cleaning and Inspection
59. Control Valve Body Assembly Assemble
60. Center Support, Output Carrier and Output Shaft Installation (6L80/6L90)
61. Center Support, Output Carrier and Output Shaft Installation (6L45)
62. 1-2-3-4 and 3-5 Reverse Clutch Assembly and 4-5-6 Clutch Assembly Installation (6L80/6L90)
63. 1-2-3-4 and 3-5 Reverse Clutch Assembly and 4-5-6 Clutch Assembly Installation (6L45/6L50)
64. Torque Converter Housing with Fluid Pump Installation (6L45/6L50)
65. Torque Converter Housing with Fluid Pump Installation (6L80/6L90)
66. Output Shaft Seal Replacement (6L90)
67. Output Shaft Seal Replacement (6L45/6L50)
68. Output Shaft Bearing Replacement - Case Extension (6L45/50)
69. Control Valve Body Assembly Installation
70. Automatic Transmission Electrical Connector Passage Sleeve Installation
71. Fluid Filter and Manual Shift Detent Assembly Installation
72. Transmission Fluid Pan Installation (6L90)
73. Case Extension Assembly Installation (6L90)
74. Case Extension Assembly Installation (6L45)
75. Propeller Shaft Transmission Flange Installation (6L90)
76. Propeller Shaft Transmission Flange Installation (6L45/50)
77. Torque Converter Installation and Holding Fixture Removal (6L90)
78. Torque Converter Installation and Holding Fixture Removal (6L45)