Automatic Transmission - 8L90 (M5U) - Description And Operation

• Description and Operation
  • Transmission Identification Information
  • Control Valve Solenoid Body Identification Information
  • Transmission General Description
  • Transmission Component and System Description
  • Manual Mode Description and Operation
    • Transmission Gear Shift Lever
    • Transmission Manual Shift Switch - Up/Down
    • Transmission Control Module
    • Manual Mode Shifting Operation
  • Tow/Haul Mode Description and Operation
  • Transmission Adaptive Functions
  • Transmission Indicators and Messages
  • Electronic Component Description
    • Transmission Control Module
    • Transmission Solenoid Valves
    • Pressure Regulating Solenoid Valves
    • Speed Sensors
    • Internal Mode Switch (IMS)
  • Park - Engine Running
    • Notes
    • Fluid Pressure Directed in Preparation for a Shift
    • Park - Engine Running - A/T System Hydraulic Diagram
  • Reverse
    • Notes
    • Fluid Pressure Directed in Preparation for a Shift
    • 4 - 5 - 6 - 7 - 8 Reverse Clutch Applies
    • 1 - 2 - 3 - 4 - 5 Reverse Clutch Applied
    • Reverse - A/T System Hydraulic Diagram
  • Neutral - Engine Running
    • Notes
    • 4 - 5 - 6 - 7 - 8 Reverse Clutch Releases
    • Neutral - Engine Running - A/T System Hydraulic Diagram
  • Drive Range, First Gear
    • Notes
    • Fluid Pressure is Directed to the 1 - 3 - 5 - 6 - 7 Clutch Assembly
    • 1 - 3 - 5 - 6 - 7 Clutch Applies
    • Drive Range, First Gear - A/T System Hydraulic Diagram
  • Drive Range, Second Gear
    • Notes
    • 2 - 3 - 4 - 6 - 8 Clutch Applies
    • 1 - 3 - 5 - 6 - 7 Clutch Releases
    • Drive Range, Second Gear - A/T System Hydraulic Diagram
  • Drive Range, Third Gear
    • Notes
    • 1 - 3 - 5 - 6 - 7 Clutch Applies
    • 1 - 2 - 7 - 8 Clutch Releases
    • Drive Range, Third Gear - A/T System Hydraulic Diagram
  • Drive Range, Fourth Gear
    • Notes
    • 4-5-6 - 7 - 8 Reverse Clutch Applies
    • 1 - 3 - 5 - 6 - 7 Clutch Releases
    • Drive Range, Fourth Gear - A/T System Hydraulic Diagram
  • Drive Range, Fifth Gear
    • Notes
    • 1 - 3 - 5 - 6 - 7 Clutch Applies
    • 2 - 3 - 4 - 6 - 8 Clutch Releases
    • Drive Range, Fifth Gear - A/T System Hydraulic Diagram
  • Drive Range, Sixth Gear
    • Notes
    • 2 - 3 - 4 - 6 - 8 Clutch Applies
    • 1 - 2 - 3 - 4 - 5 Clutch Releases
    • Drive Range, Sixth Gear - A/T System Hydraulic Diagram
  • Drive Range, Seventh Gear
    • Notes
    • 1 - 2 - 7 - 8 Reverse Clutch Applies
    • 2 - 3 - 4 - 6 - 8 Clutch Releases
    • Drive Range, Seventh Gear - A/T System Hydraulic Diagram
  • Drive Range, Eighth Gear
    • Notes
    • 2 - 3 - 4 - 6 - 8 Clutch Applies
    • 1 - 3 - 5 - 6 - 7 Clutch Releases
    • Drive Range, Eighth Gear - A/T System Hydraulic Diagram
  • Fluid Passages
    • Stator Shaft Support - Front Cover Side
    • Stator Shaft Support - Case Assembly Side
    • Case Assembly - Stator Shaft Support Side
    • Case Assembly - Case Extension Side
    • Case Extension Seal - Case Assembly Side
    • Case Extension - Case Assembly Side
    • Control Valve Upper Body Assembly - Fluid Pump Side
    • Case Assembly - Control Valve Upper Body Assembly Side
    • Control Valve Upper Body Assembly - Case Assembly Side
    • Control Valve Upper Body Assembly - Control Valve Solenoid Body Side
    • Control Valve Body Spacer Plate Assembly - Control Valve Upper Body Side
    • Control Valve Solenoid Body - Control Valve Upper Body Side
    • Control Valve Solenoid Body - Control Valve Channel Plate Side
    • Control Valve Channel Plate Spacer Plate Assembly - Control Valve Solenoid Body Side
    • Control Valve Channel Plate - Control Valve Solenoid Body Side
    • Control Valve Channel Plate - Fluid Pan Side