Covers 4L30E transmission assembly, disassembly, diagnosis, troubleshooting, and electronic controls & operation. This transmission production started in the 1990 model year.

Table of Contents:

• Powerflow Charts / Solenoid Operation
• Electronic Operation
• Fail Safe Mode
• Solenoid Specifications
• Line Pressure Check
• Connector Locations
• Vehicle Wiring Schematic
• Transmission Disassembly
• Component Rebuild
• Valve Body Check Ball Location
• Transmission Assembly
• Indexing Planetary Gears
• Main Case Checkball Location
• Torque Specifications
• Electronic Quick Checks
• Electrical Tests
• Trouble Code Chart
• Special Tool List
• Retrieving Trouble Codes 

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