This comprehensive workshop repair and rebuild manual provides detailed instructions and illustrations for the 6L80 and 6L90 6-speed longitudinal automatic transmissions. Covering a wide range of years and models, this manual is an invaluable resource for both professional mechanics and DIY enthusiasts.

The manual delves into every aspect of the transmission, starting with a clear introduction and covering key components like the torque converter, lubrication points, and seal locations. For troubleshooting, the manual includes a comprehensive guide to common issues, their causes, and effective solutions.

Furthermore, it offers detailed explanations of trouble codes, a list of essential special tools, and step-by-step instructions for both assembly and disassembly procedures. Users will find valuable information on upgrading pistons, understanding solenoid resistance, identifying check ball locations, and interpreting shift speed and line pressure readings.

The manual also features a detailed analysis of the transmission's internal workings, including the input and reverse drums, gear train, unit assembly, wiring schematic, and clutch assembly, including forward and overrun clutches. The valve body section provides an in-depth look at its components and function. The final section highlights case preparation for optimal performance.

This manual, with its detailed illustrations, step-by-step instructions, and comprehensive coverage of the transmission, provides a reliable and efficient resource for repairing and rebuilding these transmissions.

The 6L80 and 6L90 are highly advanced automatic transmissions designed for use in a variety of vehicles. They are developed by General Motors and boast impressive features such as 8 forward gears and a robust construction. These transmissions are known for their smooth shifting, excellent fuel economy, and ability to handle high torque outputs. The 6L80 and 6L90 were initially introduced in 2006, with the 6L80 used in rear wheel drive applications and the 6L90 primarily for front wheel drive and all wheel drive vehicles. These transmissions are found in a wide range of vehicles, including popular models from GM brands like Chevrolet, Buick, Cadillac, and GMC, as well as some foreign manufacturers.

The 6L80 and 6L90 are complex systems that require specialized knowledge for proper maintenance and repair. A workshop repair and rebuild manual is an essential resource for mechanics and technicians working on these transmissions. These manuals provide detailed instructions, diagrams, and technical specifications for troubleshooting common issues, performing necessary repairs, and rebuilding the transmission to factory specifications. With a comprehensive repair manual, mechanics can confidently diagnose and address problems, ensuring the smooth and reliable operation of these crucial components. This manual serves as a vital tool for professionals seeking to maintain the integrity and longevity of 6L80 and 6L90 transmissions.