GM 6L80 Transmissions: How to Rebuild & Modify (Sa Design, SA523) by Steve Garrett

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.

From the Publisher 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. 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. As with the RPO tag, the transmission tag contains a tremendous amount of information about the transmission, including the model code and the build/Julian date. Many transmission updates are attached to a specific Julian date, so when ordering parts, you may be required to provide the tag information to the parts person to get the correct parts for your application. Adapt-A-Case’s 6L80 T-46664AC is used to align the pump halves prior to torquing the pump bolts. Proper pump alignment is critical to prevent pump damage during operation. The 6L80 is equipped with an electrohydraulic device known as a transmission electrical hydraulic control module (TEHCM). The TEHCM houses the transmission computer (TCM), six pulse width modulated pressure control solenoids, two on/off solenoids, four clutch pressure switches, and the temperature sensors. If it is faulty, the TEHCM is designed to be replaced as an assembly. The TEHCM requires programing if it is replaced. Major Mechanical Components Disassemble the pump valves and inspect the valves and bores for wear and damage. If it is not damaged or worn, clean the pump components and lubricate them with transmission fluid and reassemble. For the aftermarket method, use a wire-type feeler gauge to measure the clearance between the snap ring and the apply plate. The specification is 0.057 to 0.065 inch (1.4478 to 1.651 mm). The factory method installs the planetary and output shaft as an assembly. Using GM DT 47786 lifting tool (or an equivalent), twist the tool into the planetary threaded hole in the center of the planetary. Lift the completed assembly and install it into the case. Rotate the output shaft to make sure that the planetary is fully installed.