GM - 6T40-45-Tech-Guide - (5-2008).pdf

The Hydra-matic 6T40/45 Technician’s Guide is

another Powertrain publication from the Technician’s

Guide series of books. The purpose of this

publication, as is the case with other Technician’s

Guides, is to provide complete information on the

theoretical operating characteristics of this

transmission. Operational theories of the mechanical,

hydraulic and electrical components are presented in

a sequential and functional order to better explain

their operation as part of the system.

In the first section of this book, entitled “Principles

of Operation”, detailed explanations of the major

components and their functions are presented. In

every situation possible, text describes component

operation during the apply and release cycle as well

as situations where it has no effect at all. The

descriptive text is then supported by numerous

graphic illustrations to further emphasize the

operational theories presented.

The second section, entitled “Power Flow”, blends

the information presented in the “Principles of

Operation” section into the complete transmission

assembly. In the first part of the Power Flow section,

the mechanical transfer of torque from the engine

through the transmission is graphically displayed on

a full page while a narrative description is provided

on the facing page. The mechanical power flow is

followed by the hydraulic power flow which describes

hydraulic fluid flow as it applies components or shifts

valves in the system.

The third section, entitled “Complete Hydraulic

Circuits”, displays complete hydraulic schematics,

including active fluid passages, for each operating

range. Fold-out pages containing fluid flow

schematics and two dimensional illustrations of major

components graphically display hydraulic circuits.

This information is extremely useful when tracing

fluid circuits for learning or diagnosis purposes.

The “Appendix” section of this book provides additional

transmission information regarding lubrication circuits,

seal locations, illustrated parts lists and more. Although

this information is available in current model year

Service Manuals, its inclusion provides for a quick

reference guide that is useful to the technician.

Production of the Hydra-matic 6T40/45 Technician’s

Guide was made possible through the combined

efforts of many staff areas within the General Motors

Powertrain Division. As a result, the Hydra-matic

6T40/45 Technician’s Guide was written to provide

the user with the most current, concise and usable

information available regarding this product.

Language - English

Format - PDF Download

Pages - 180