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Home >> GMC Truck >> 2013 >> Sierra 2500 4WD V8-6.0L (CNG) >> Repair and Diagnosis >> Transmission and Drivetrain >> Automatic Transmission/Transaxle >> Service and Repair >> Overhaul >> 6L45/6L50/6L80/6L90 - Automatic Transmission >> Overhaul Procedure Steps

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
4. Control Valve Body Assembly Removal (UID 144630990)
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
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
20. Low and Reverse Clutch Overhaul
21. Low and Reverse Clutch Backing Plate Retaining Ring Measurement
22. 4-5-6 Clutch Dampener Overhaul
23. 4-5-6 Clutch Overhaul
24. 4-5-6 Clutch Backing Plate Retaining Ring Measurement
25. 1-2-3-4 and 3-5 Reverse Clutch Overhaul (6L50/6L80/6L90)
26. 1-2-3-4 Clutch Backing Plate Retaining Ring Measurement
27. 3-5 Reverse Clutch Backing Plate Retaining Ring Measurement (6L80/6L90)
28. Torque Converter Housing with Fluid Pump Disassemble
29. Fluid Pump Cover Cleaning and Inspection
30. 1-2-3-4 and 3-5 Reverse Clutch Fluid Seal Ring Installation (6L80/6L90)
31. Torque Converter Housing Cleaning and Inspection
32. Torque Converter Fluid Seal Replacement
33. Transmission Fluid Cooler Pipe Seal Replacement
34. Fluid Pump Selective Measurement
35. Torque Converter Housing with Fluid Pump Assemble
36. Fluid Pump Cover Installation
37. Control Valve Body Assembly Disassemble (UID 144630991)
38. Control Valve Lower Body Assembly Cleaning and Inspection
39. Control Valve Upper Body Assembly Cleaning and Inspection
40. Control Valve Body Assembly Assemble
41. Center Support, Output Carrier and Output Shaft Installation (6L80/6L90)
42. 1-2-3-4 and 3-5 Reverse Clutch Assembly and 4-5-6 Clutch Assembly Installation (6L80/6L90)
43. Torque Converter Housing with Fluid Pump Installation
44. Propeller Shaft Front Slip Yoke Oil Seal Replacement
45. Control Valve Body Assembly Installation
46. Automatic Transmission Electrical Connector Passage Sleeve Installation
47. Fluid Filter and Manual Shift Detent Assembly Installation
48. Transmission Fluid Pan Installation
49. Case Extension Assembly Installation
50. Torque Converter Installation and Holding Fixture Removal
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