1-800-551-4754 
GM 6L80 Transmissions: How to Rebuild & Modify
Introduced in 2006, the 6L80 has become the most popular General Motors transmission in production today. Millions are on roads around the world, and the 6L series of transmissions has overtaken the 4L60E as the most popular rebuild in the majority of transmission shops and dealerships today.
Automatic transmissions are often seen as mysterious and overly complicated, but much of the guesswork has been simplified to its basic elements in this easy-to-follow guide. This book covers the identification process, operation, diagnostic pointers, common failures, and repair and rebuild procedures for the 6L80 transmission. Upgrades that are available to make the 6L80 more robust are covered as well as the companies that offer upgrades.
This detailed, step-by-step instructional manual is authored by engineer, instructor, speaker, and author Steve Garrett. Meticulous step-by-step photos of the rebuild process are featured along with torque specifications and identification of all major and most minor components.
Chapter 1: GM 6L80 Transmissions
TEHCM
Gearsets
Transmission Identification
RPO Identification
Transmission Tag Information
Inspection and Service
Tools
Power and Ground Testing
Electrical Current Flow
Adhesives, Sealers, and Lubricants
Cooler Flushing
Chapter 2: Mechanical Electronic Components
Range Reference Chart and Power Flow
6L80 Electronic Components
TEHCM Shared Data and Additional Inputs
Scan Tool Diagnosis, Data Parameters, DTCs, and Programming
Adaptive Learning
On-Vehicle Repairs and Adjustments
TEHCM, TFP, TFT, Speed Sensor, and IMS Replacement
Pressure Testing and Road Testing
Cleaning and Inspection
Chapter 3: Component Service Disassembly and Assembly
Torque Converter
Holding Fixture
Extension Housing
Oil Pan Filter
Pass-Through Connector
TEHCM/Valve Body
Pump Service
1-2-3-4/3-5-R and 4-5-6 Clutch Removal and Disassembly
1-2-3-4/3-5-R Clutch Assembly
4-5-6 Clutch Assembly
2-6 Center Support, Low/Reverse Clutch, and Low Sprag Removal
2-6 Clutch Assembly
Component Service Assembly
Chapter 4: TEHCM Inspection and Testing
GM Factory Method
Aftermarket Method
Valve Function
Valve Body Assembly and TEHCM Installation
Valve Body, Pump Valve Repair Kits, and Additional Components
Oil Filter and Oil Pan Installation
Fluid, Capacity, Checks, and Operation
On-Vehicle Repairs and Adjustments
Adaptive Learning
Using a 6L80 in a Non-GM Application or GM Application Not Originally Equipped
Other Aftermarket Products and Non-Internal Components
Diagnostic Pointers
Appendix
Introduced in 2006, the 6L80 has become the most popular General Motors transmission in production today. Millions are on roads around the world, and the 6L series of transmissions has overtaken the 4L60E as the most popular rebuild in the majority of transmission shops and dealerships today.
Automatic transmissions are often seen as mysterious and overly complicated, but much of the guesswork has been simplified to its basic elements in this easy-to-follow guide. This book covers the identification process, operation, diagnostic pointers, common failures, and repair and rebuild procedures for the 6L80 transmission. Upgrades that are available to make the 6L80 more robust are covered as well as the companies that offer upgrades.
This detailed, step-by-step instructional manual is authored by engineer, instructor, speaker, and author Steve Garrett. Meticulous step-by-step photos of the rebuild process are featured along with torque specifications and identification of all major and most minor components.
Chapter 1: GM 6L80 Transmissions
TEHCM
Gearsets
Transmission Identification
RPO Identification
Transmission Tag Information
Inspection and Service
Tools
Power and Ground Testing
Electrical Current Flow
Adhesives, Sealers, and Lubricants
Cooler Flushing
Chapter 2: Mechanical Electronic Components
Range Reference Chart and Power Flow
6L80 Electronic Components
TEHCM Shared Data and Additional Inputs
Scan Tool Diagnosis, Data Parameters, DTCs, and Programming
Adaptive Learning
On-Vehicle Repairs and Adjustments
TEHCM, TFP, TFT, Speed Sensor, and IMS Replacement
Pressure Testing and Road Testing
Cleaning and Inspection
Chapter 3: Component Service Disassembly and Assembly
Torque Converter
Holding Fixture
Extension Housing
Oil Pan Filter
Pass-Through Connector
TEHCM/Valve Body
Pump Service
1-2-3-4/3-5-R and 4-5-6 Clutch Removal and Disassembly
1-2-3-4/3-5-R Clutch Assembly
4-5-6 Clutch Assembly
2-6 Center Support, Low/Reverse Clutch, and Low Sprag Removal
2-6 Clutch Assembly
Component Service Assembly
Chapter 4: TEHCM Inspection and Testing
GM Factory Method
Aftermarket Method
Valve Function
Valve Body Assembly and TEHCM Installation
Valve Body, Pump Valve Repair Kits, and Additional Components
Oil Filter and Oil Pan Installation
Fluid, Capacity, Checks, and Operation
On-Vehicle Repairs and Adjustments
Adaptive Learning
Using a 6L80 in a Non-GM Application or GM Application Not Originally Equipped
Other Aftermarket Products and Non-Internal Components
Diagnostic Pointers
Appendix
Related Products
