This comprehensive 6L80 6L90 Automatic Gearbox Service Repair Manual is your ultimate guide to maintaining and repairing these transmissions found in a range of vehicles from 2006 to 2014. The manual offers detailed step-by-step instructions, complemented by high-quality diagrams and illustrations, making it suitable for both DIY enthusiasts and experienced mechanics.

The manual covers a wide range of topics, guiding you through every aspect of the 6L80 and 6L90 transmissions. You'll find information on troubleshooting common issues, understanding trouble codes, and utilizing specialized tools. The manual includes detailed sections on transmission disassembly and assembly, allowing you to tackle complex repairs with confidence.

Learn about the intricate workings of the torque converter, lubrication points, and seal locations. The manual also provides valuable information on upgrading pistons, solenoid resistance charts, check ball locations, and shift speed charts.

In addition to the detailed technical information, the manual features specific sections on the various components of the transmission, including the input drum, reverse drum, gear train, valve body, and clutch assembly. You'll find a dedicated section for the overrun clutch and forward clutch, as well as a comprehensive wiring schematic to help you understand the transmission's electrical system.

This manual is an invaluable resource, providing all the necessary information you need to successfully service and repair your 6L80 or 6L90 transmission.

The 6L80 and 6L90 are six-speed automatic transmissions developed by General Motors. These transmissions are renowned for their strength and durability, finding widespread application in a variety of GM vehicles, including trucks, SUVs, and passenger cars. The 6L80, designed for rear-wheel drive and all-wheel drive applications, is typically paired with larger engines, while the 6L90, geared towards front-wheel drive and all-wheel drive configurations, is often found in lighter vehicles.

Both the 6L80 and 6L90 benefit from advanced technology, including electronic control units (ECUs) that adapt to driving conditions and optimize gear selection for improved performance and fuel efficiency. These transmissions are renowned for their smooth shifting, responsive acceleration, and towing capabilities. Notably, the 6L90 features a unique "tap-shift" function that allows for manual control over gear selection, catering to drivers who desire a more involved driving experience. Furthermore, both the 6L80 and 6L90 are known for their robust construction, incorporating heavy-duty components designed to withstand demanding conditions and high torque outputs. However, like any complex mechanical system, these transmissions require regular maintenance and servicing to ensure their longevity and optimal performance.