Automatic Transmission - 6L80/6L90 - Removal & Installation, Service, Overhaul, Troubleshooting & Diagnosis

• Diagnostic Information And Procedures
  • Symptoms - Automatic Transmission
    • Notes
    • Visual/Physical Inspection
    • Intermittent
    • Symptom List
  • Control Solenoid Valve and Transmission Control Module Assembly Inspection
    • Notes
    • Control Solenoid (w/Body and TCM) Valve Assembly Housing and Filter Plate
  • Control Solenoid Valve and Transmission Control Module Assembly Input Shaft Speed/Output Shaft Speed Input Test
  • Control Solenoid Valve and Transmission Control Module Assembly Cleaning
  • Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test
    • Special Tools
    • Test
  • Service Fast Learn Adapts
    • Notes
    • Troubleshooting
  • Tow/Haul Switch/Indicator Always On or Inoperative
    • Notes
    • Circuit/System Description
    • Diagnostic Aids
    • Reference Information
    • Circuit/System Verification
    • Circuit/System Testing
    • Component Testing
    • Repair Procedures
  • Transmission Fluid Check
    • Notes
    • Cold Check Procedure
    • Hot Check Procedure
    • Fluid Condition Inspection
  • Line Pressure Check
    • Notes
    • Special Tools
    • Check
  • Road Test
    • Notes
    • Electrical Function Check
    • Upshift Control and Torque Converter Clutch (TCC) Apply
    • Part Throttle Detent Downshift
    • Manual Downshifts
    • Manual Gear Range Selection
      • Notes
      • Reverse
      • Driver Shift Control (DSC)
  • Torque Converter Diagnosis
    • Notes
    • Torque Converter Stator
    • Poor Acceleration at Low Speed
    • Poor Acceleration at High Speed
    • Noise
    • Torque Converter Clutch Shudder
    • If Shudder Occurs During TCC Apply or Release
    • If Shudder Occurs After TCC has Applied
  • Flex Plate/Torque Converter Vibration Test
    • Isolating Vibration
    • Indexing Torque Converter
  • Bushing and Mating Shaft Inspection
  • Vibration
  • Noise and Vibration Analysis
  • Whine/Growl Noise That Changes with Vehicle Speed
  • Noise in First or Reverse Gear
  • Noise in First, Second, Third, Fourth, Fifth, or Reverse Gear
  • Noise in First, Second, Sixth, or Reverse Gear
  • Noise in Second or Sixth Gear
  • Noise During 3-4 or 4-3 Shifts
  • Noise in Fourth, Fifth, or Sixth Gear
  • Clutch Plate Diagnosis
    • Composition Plates
    • Steel Plates
    • Causes of Burned Clutch Plates
  • Engine Coolant/Water in Transmission
  • Fluid Leak Diagnosis
    • General Method
    • Powder Method
    • Dye and Black Light Method
    • Find the Cause of the Leak
    • Possible Points of Fluid Leaks
  • Case Porosity Repair
  • Transmission Fluid Cooler Flushing and Flow Test
    • Notes
    • Cooler Flow Check and Flushing Steps
    • Machine Set-up
    • Determine Minimum Flow Rate
    • Back Flush Procedure
    • Forward Flush
    • Flow Test
    • Code Recording Procedure
    • Clean-up
  • Automatic Transmission Fluid Leaks
  • No Park or Drive
  • Harsh Garage Shift
  • No Drive in All Ranges
  • No Drive or Reverse Gear
  • No First Gear
  • No First and Reverse Gears
  • Harsh, Soft, Delayed or Slipping First or Reverse Gear
  • Stuck in First or Reverse Gear
  • No First, Second, Third, and Fourth Gear
  • Harsh, Soft, Delayed or Slipping 1-2-3-4 Shift
  • No First, Second, Third, Fourth, Fifth, or Reverse Gear
  • No First, Second, Sixth, or Reverse Gear
  • No Second and Sixth Gear
  • Harsh, Soft, Delayed or Slipping Second or Sixth Gear
  • Stuck in Second or Sixth Gear
  • Vibration in Second, Third, Fourth, Fifth, or Sixth Gear
  • No Third, Fifth, and Reverse Gear
  • Harsh, Soft, Delayed or Slipping Third, Fifth, or Reverse Gear
  • No Fourth, Fifth, and Sixth Gear
  • Harsh, Soft, Delayed or Slipping 4-5-6 Shift
  • No Torque Converter Clutch Apply
  • No Torque Converter Clutch Release
  • No Reverse Gear
  • Fluid Pressure High or Low
• Repair Instructions - On Vehicle
  • Transmission Fluid Filler Tube and Seal Replacement
    • Notes
    • Removal Procedure
    • Installation Procedure
  • Range Selector Lever Cable Replacement
    • Removal Procedure
    • Installation Procedure
  • Range Selector Lever Cable Adjustment
    • Notes
    • Cable Re-Adjustment
  • Range Selector Lever Cable Bracket Replacement
  • Automatic Transmission Range Selector Lever Replacement
  • Transmission Fluid Auxiliary Cooler Replacement
    • Removal Procedure
    • Installation Procedure
  • Transmission Fluid Cooler Hose/Pipe Quick-Connect Fitting Disconnection and Connection
    • Notes
    • Removal Procedure
    • Installation Procedure
  • Transmission Fluid Cooler Hose/Pipe Connector Replacement (Radiator)
  • Transmission Fluid Cooler Hose/Pipe Replacement
    • Removal Procedure
    • Installation Procedure
  • Transmission Heat Shield Replacement
  • Automatic Transmission Fluid Pressure Test Hole Plug Replacement
    • Removal Procedure
    • Installation Procedure
  • Automatic Transmission Electrical Connector Passage Sleeve Replacement
  • Automatic Transmission Fluid, Fluid Pan and/or Filter Replacement
  • Transmission Mount Inspection
  • Transmission Mount Replacement (2WD)
  • Transmission Mount Replacement (4WD)
  • Case Extension and Gasket Replacement
  • Transmission Output Shaft Seal Replacement (Four Wheel Drive)
  • Propeller Shaft Front Slip Yoke Oil Seal Replacement (Two Wheel Drive)
  • Manual Shift Shaft and Seal Replacement
  • Manual Shift Detent Lever and Park Pawl Actuator Replacement
  • Manual Shift Shaft Position Switch Replacement
  • Control Solenoid Valve and Transmission Control Module Assembly Replacement
  • Control Valve Lower Body and Upper Body Replacement
  • Input and Output Speed Sensor Replacement
  • Transmission Converter Cover Replacement
  • Transmission Replacement
    • Special Tools
    • Removal Procedure
    • Installation Procedure
• Repair Instructions - Off Vehicle
  • Torque Converter Removal and Holding Fixture Installation
  • Case Extension Assembly Removal
  • Transmission Fluid Pan, Filter and Electrical Connector Passage Sleeve Removal (6L80)
  • Control Valve Body Assembly Removal
  • Torque Converter Housing with Fluid Pump Removal
  • 1-2-3-4 and 3-5 Reverse Clutch Assembly and 4-5-6 Clutch Assembly Removal (6L50/80/90)
  • Center Support, Output Carrier and Output Shaft Removal (6L80/6L90)
  • Manual Shift Shaft and Parking System Components Overhaul (6L80/6L90)
  • Manual Shift Shaft Seal Replacement
  • Output Shaft Seal Replacement (AWD Models Only)
  • Case Inspection
  • Output Shaft Disassemble
  • Output Shaft Assemble (6L50/80/90)
  • Output Carrier Assembly Overhaul (6L80)
  • Output Carrier Assembly Overhaul (6L90)
  • Output Carrier to Output Shaft Assemble (6L80/6L90)
  • 2-6 Clutch Overhaul (6L80)
    • 2-6 Clutch Plates Removal
    • 2-6 Clutch Piston Replacement
    • 2-6 Clutch Plates Installation
  • 2-6 Clutch Overhaul (6L90)
    • 2-6 Clutch Plates Removal
    • 2-6 Clutch Piston Replacement
    • 2-6 Clutch Plates Installation
  • Low and Reverse Clutch Overhaul (6L80)
    • Low and Reverse Clutch Plate Removal
    • Low and Reverse Clutch Piston Removal
    • Low and Reverse Clutch Piston Installation
    • Low and Reverse Clutch Plate Installation
  • Low and Reverse Clutch Overhaul (6L90)
    • Low and Reverse Clutch Plate Removal
    • Low and Reverse Clutch Piston Removal
    • Low and Reverse Clutch Piston Installation
    • Low and Reverse Clutch Plate Installation
  • Low and Reverse Clutch Backing Plate Retaining Ring Measurement
  • 4-5-6 Clutch Dampener Overhaul (6L50/80/90)
  • 4-5-6 Clutch Overhaul (6L80)
    • 4-5-6 Clutch Plates Removal
    • 4-5-6 Clutch Piston Removal
    • Turbine Shaft Fluid Seal Ring Replacement
    • 4-5-6 Clutch Piston Installation
    • 4-5-6 Clutch Plates Installation
  • 4-5-6 Clutch Overhaul (6L90)
    • 4-5-6 Clutch Plates Removal
    • 4-5-6 Clutch Piston Removal
    • Turbine Shaft Fluid Seal Ring Replacement
    • 4-5-6 Clutch Piston Installation
    • 4-5-6 Clutch Plates Installation
  • 4-5-6 Clutch Backing Plate Retaining Ring Measurement
  • 1-2-3-4 and 3-5 Reverse Clutch Overhaul (6L50/6L80)
    • 1-2-3-4 and 3-5 Reverse Clutch Plates Removal
    • 1-2-3-4 Clutch Piston Removal
    • 3-5 Reverse Clutch Piston Removal
    • 3-5 Reverse Clutch Air Bleed Inspection (6L80/6L90)
    • 1-2-3-4 and 3-5 Reverse Clutch Piston Seals Replacement
    • 3-5 Reverse Clutch Piston Installation
    • 1-2-3-4 Clutch Piston Installation
    • 1-2-3-4 Clutch Plate Installation
    • 3-5 and Reverse Clutch Plate Installation
    • 1-2-3-4 and 3-5 Reverse Clutch Bearing Assembly Replacement
  • 1-2-3-4 and 3-5 Reverse Clutch Overhaul (6L90)
    • 1-2-3-4 and 3-5 Reverse Clutch Plates Removal
    • 1-2-3-4 Clutch Piston Removal
    • 3-5 Reverse Clutch Piston Removal
    • 3-5 Reverse Clutch Air Bleed Inspection
    • 1-2-3-4 and 3-5 Reverse Clutch Piston Seals Replacement
    • 3-5 Reverse Clutch Piston Installation
    • 1-2-3-4 Clutch Piston Installation
    • 1-2-3-4 Clutch Plate Installation
    • 3-5 and Reverse Clutch Plate Installation
    • 1-2-3-4 and 3-5 Reverse Clutch Bearing Assembly Replacement
  • 1-2-3-4 Clutch Backing Plate Retaining Ring Measurement (6L50/80/90)
    • Fluid Passage Plug Kit Installation
    • Apply Compressed Air and Measurement
  • 3-5 Reverse Clutch Backing Plate Retaining Ring Measurement (6L80/6L90)
  • Torque Converter Housing with Fluid Pump Disassemble
  • Fluid Pump Cover Cleaning and Inspection
  • 1-2-3-4 and 3-5 Reverse Clutch Fluid Seal Ring Installation (6L80/90)
  • Torque Converter Housing Cleaning and Inspection
  • Torque Converter Fluid Seal Replacement
  • Transmission Fluid Cooler Pipe Seal Replacement
  • Fluid Pump Selective Measurement
  • Torque Converter Housing with Fluid Pump Assemble
  • Fluid Pump Cover Installation
  • Control Valve Body Assembly Disassemble
    • Input and Output Speed Sensor Assembly Removal
    • Manual Shaft Detent Assembly and Manual Shift Shaft Position Switch Removal
    • Control Solenoid Valve Assembly Removal
    • Upper and Lower Valve Bodies Disassemble
  • Control Valve Lower Body Assembly Cleaning and Inspection
  • Control Valve Upper Body Assembly Cleaning and Inspection
  • Control Valve Body Assembly Assemble
    • Upper to Lower Control Valve Body Assembly Assemble
    • Filter Plate Installation
    • Control Solenoid Valve Assembly Installation
    • Manual Shift Shaft Position Switch Installation
    • Valve Body, Control Solenoid Torque Sequence
    • Control Solenoid Valve Assembly Contact Gap Inspection
    • Input and Output Speed Sensor Assembly Installation
  • Center Support, Output Carrier and Output Shaft Installation (6L80/6L90)
  • 1-2-3-4 and 3-5 Reverse Clutch Assembly and 4-5-6 Clutch Assembly Installation (6L50/80/90)
  • Torque Converter Housing with Fluid Pump Installation
  • Propeller Shaft Front Slip Yoke Oil Seal Replacement
  • Control Valve Body Assembly Installation
  • Automatic Transmission Electrical Connector Passage Sleeve Installation
  • Fluid Filter and Manual Shift Detent Assembly Installation
  • Transmission Fluid Pan Installation (6L80)
  • Case Extension Assembly Installation
  • Torque Converter Installation and Holding Fixture Removal
• Description And Operation
  • Definitions and Abbreviations
    • Throttle Positions
    • Shift Condition Definitions
    • Noise Conditions
    • Driver Shift Control
    • Transmission Abbreviations
  • Transmission Identification Information
  • Transmission General Description
  • Transmission Component and System Description
  • Shift Stabilization Description and Operation
  • Tow/Haul Mode Description and Operation
  • Transmission Adaptive Functions
  • Transmission Indicators and Messages
  • Electronic Component Description
    • Notes
    • Internal Mode Switch (IMS)
    • Input Speed Sensor (ISS)
    • Output Speed Sensor (OSS)
  • Automatic Transmission Inline 16-Way Connector Description
  • Automatic Transmission Hydraulic Diagrams
    • Park - Engine Running
      • Notes
      • Fluid Pressure Directed in Preparation for a Shift
        • Manual Valve
        • CBR1/C456 Pressure Control (PC) Solenoid 3
        • CBR1/C456 Clutch Regulator Valve
        • Shift Solenoid 1
        • TCC Regulator Valve and Shuttle Valve
        • #2 Ball Check Valve
        • Clutch Select Valve 2
        • Shift Solenoid 2
        • 3-5 Reverse Clutch Regulator Valve
        • #3 Ball Check Valve
        • Clutch Select Valve #3
      • Park - Engine Running - A/T System Hydraulic Diagram
    • Reverse
      • Notes
      • Fluid Pressure Directed in Preparation for a Shift
        • Manual Valve
        • #2 Ball Check Valve
        • Clutch Select Valve 2
      • Low and Reverse Clutch Applies
        • Clutch Select Valve 3
        • Low and Reverse Clutch
        • #5 Ball Check Valve
      • 3-5 Reverse Clutch Applies
        • C35R Pressure Control Solenoid 2
        • 3-5 Reverse Clutch Regulator Valve
        • 3-5 Reverse Boost Valve
        • 3-5 Reverse Clutch
      • Reverse - A/T System Hydraulic Diagram
    • Neutral - Engine Running
      • Notes
      • 3-5 Reverse Clutch Releases
        • Manual Valve
        • C35R Pressure Control Solenoid 2
        • 3-5 Reverse Clutch Boost Valve
        • 3-5 Reverse Clutch Regulator Valve
        • 3-5 Reverse Clutch
        • Clutch Select Valve 3
      • Neutral - Engine Running - A/T System Hydraulic Diagram
    • Drive Range, First Gear Engine Braking
      • Notes
      • Fluid Pressure is Directed to the 1-2-3-4 Clutch and the Low and Reverse Clutch to Provide Engine Braking
        • Manual Valve
        • Clutch Select Valve 2
        • Clutch Select Valve 3
        • #1 Ball Check Valve
        • #6 Ball Check Valve
      • 1-2-3-4 Clutch Applies
        • C1234 Pressure Control Solenoid 5
        • 1-2-3-4 Clutch Regulator Valve
        • 1-2-3-4 Clutch Boost Valve
        • 1-2-3-4 Clutch
      • Drive Range, First Gear Engine Braking - A/T System Hydraulic Diagram
    • Drive Range, First Gear
      • Notes
      • Low & Reverse Clutch Releases
        • Shift Solenoid 1
        • Clutch Select Valve 2
        • CBR1/C456 Pressure Control Solenoid 3
        • CBR1/C456 Clutch Regulator Valve
        • #4 Ball Check Valve
        • #5 Ball Check Valve
        • #7 Ball Check Valve
        • Low and Reverse Clutch
      • Drive Range, First Gear - A/T System Hydraulic Diagram
    • Drive Range, Second Gear
      • Notes
      • Second Clutch Applies
        • CB26 Pressure Control Solenoid 4
        • 2-6 Clutch Regulator Gain Valve
        • 2-6 Clutch Regulator Valve
        • 2-6 Clutch
      • Drive Range, Second Gear - A/T System Hydraulic Diagram
    • Drive Range, Third Gear
      • Notes
      • 3-5 Reverse Clutch Applies
        • C35R Pressure Control Solenoid 2
        • 3-5 Reverse Clutch Boost Valve
        • 3-5 Reverse Clutch Regulator Valve
        • 3-5 Reverse Clutch
      • 2-6 Clutch Releases
        • CB26 Pressure Control Solenoid 4
        • 2-6 Clutch Regulator Valve
        • 2-6 Clutch
      • Drive Range, Third Gear - A/T System Hydraulic Diagram
    • Drive Range, Third Gear Default
      • Notes
      • 1-2-3-4 Clutch Stays Applied
        • Shift Solenoid 2
        • Clutch Select Valve 3
        • 1-2-3-4 Clutch Regulator Valve
        • 1-2-3-4 Clutch
      • 3-5 Reverse Clutch Applied or Applies
        • C35R Pressure Control Solenoid 2
        • 3-5 Reverse Clutch Regulator Valve
        • 3-5 Reverse Clutch Boost Valve
        • 3-5 Reverse Clutch
      • Drive Range, Third Gear Default - A/T System Hydraulic Diagram
    • Drive Range - Fourth Gear
      • Notes
      • 4-5-6 Clutch Applies
        • CBR1/C456 Pressure Control Solenoid 3
        • CBR1/C456 Clutch Regulator Valve
        • 4-5-6 Clutch Boost Valve
        • Clutch Select Valve 2
        • 4-5-6 Clutch
      • 3-5 Reverse Clutch Releases
        • C35R Pressure Control Solenoid 2
        • 3-5 Reverse Clutch Boost Valve
        • 3-5 Reverse Clutch Regulator Valve
        • 3-5 Reverse Clutch
      • Drive Range, Fourth Gear - A/T System Hydraulic Diagram
    • Drive Range, Fifth Gear
      • Notes
      • 3-5 Reverse Clutch Applies
        • C35R Pressure Control Solenoid 2
        • 3-5 Reverse Clutch Boost Valve
        • 3-5 Reverse Clutch Regulator Valve
        • Clutch Select Valve 2
        • 3-5 Reverse Clutch
      • 1-2-3-4 Clutch Releases
        • C1234 Pressure Control Solenoid 5
        • 1-2-3-4 Clutch Regulator Valve
        • 1-2-3-4 Clutch Boost Valve
        • 1-2-3-4 Clutch
      • Drive Range, Fifth Gear - A/T System Hydraulic Diagram
    • Drive Range, Fifth Gear Default
      • Notes
      • 3-5 Reverse Clutch Applies
        • C35R Pressure Control Solenoid 2
        • 3-5 Reverse Clutch Boost Valve
        • 3-5 Reverse Clutch Regulator Valve
        • 3-5 Reverse Clutch
        • Clutch Select Valve 3
      • 1-2-3-4 Clutch Releases or 2-6 Clutch Releases
        • C1234 Pressure Control Solenoid 5
        • 2-6 CB26 Pressure Control Solenoid 4
      • Torque Converter Clutch Releases
        • TCC Pressure Control Solenoid
      • Drive Range, Fifth Gear Default - A/T System Hydraulic Diagram
    • Drive Range, Sixth Gear
      • Notes
      • 2-6 Clutch Applies
        • CB26 Pressure Control Solenoid 4
        • 2-6 Clutch Regulator Gain Valve
        • 2-6 Clutch Regulator Valve
        • 2-6 Clutch
      • 3-5 Clutch Releases
        • C35R Pressure Control Solenoid 2
        • 3-5 Reverse Clutch Boost Valve
        • 3-5 Reverse Clutch Regulator Valve
        • 3-5 Reverse Clutch
      • Drive Range, Sixth Gear - A/T System Hydraulic Diagram
  • Fluid Passages
• Special Tools