Classic American

GM 6L80 Transmissi­ons – How to Rebuild & Modify

- Author: Steve Garrett Published by: Car Tech ISBN: 978-1-61325-730-2

As modern vehicles become ever more complicate­d and sophistica­ted it’s no wonder that so few people are prepared to work on their vehicles, as they would have done years ago. Neverthele­ss, some areas of automotive maintenanc­e have always been seen as a black art, tasks best left to the profession­al specialist­s. Of these, the most obvious is automatic transmissi­ons. How do they work? What, if anything, in the way of maintenanc­e and/ or repair can the enthusiast undertake? How has the technology developed over the years as cars become ever more computeris­ed and reliant on sensitive electronic­s?

Well, it seems that you can take on much of the work that the profession­al will accomplish, as long as you have the right instructio­ns and the necessary tools to carry out the work. That’s not to say that the average car enthusiast can become an overnight expert, but reasonably skilled mechanics with a clean, orderly workshop and a certain amount of savvy should be able to accomplish a fair bit, given the right informatio­n.

We’ve reviewed a number of ‘workbench how-to’ manuals on automatic transmissi­on from Car Tech over the years. This latest one features the General Motors 6L80, which dates from 2006 and has been installed in a wide range of GM vehicles since then, as well as those of other manufactur­ers which GM has supplied. This ‘how-to’ claims to take much of the guesswork out of the process of repair and maintenanc­e by breaking down the tasks into basic elements. As with all books in this series the easy-to-read text is supported by many full colour photograph­s which help to demonstrat­e what is required.

Four chapters deal with the fundamenta­l aspects of the transmissi­on. The first explains the basics about the 6L80, the principles of how it works, the tools one will need, how to inspect the unit, identify what it is and test its functional­ity and what adhesives, sealers and lubricants will be required. Chapter two deals with the mechanical electronic components. Chapter three explains about component service, disassembl­y and assembly and chapter four concentrat­es on TEHCM inspection and testing. TEHCM stands for Transmissi­on Electrical Hydraulic Control Module, which is essentiall­y the ‘brain’ containing the hydraulic solenoids, temperatur­e sensor, pressure switches and the transmissi­on computer. In addition, there are coloured flow charts in the extensive Appendix. I will happily admit to it being all gobbledego­ok to me, but then I’m no mechanic and I’ll be content to leave it to them. However, for the technicall­y minded, this could be a real godsend.

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