System Overview: Notes

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This transmission is a 6-speed electronically controlled transmission which uses planetary gears. Gear selection is achieved by the electronic control of transmission fluid flow to operate various internal clutches. This transmission may also be refered to as a 6R140 in service information.

This transmission includes:

Torque converter with an integral converter clutch
Electronic shift and pressure controls
Single planetary gearset
Double (ravigneaux) planetary gearset
Two multi-disc holding clutches
Three multi-plate drive clutches
one way holding clutch
Main control valve body unit

The main control consists of a valve body assembly with solenoids inside the transmission and is controlled by a PCM for gas engine applications and a Transmission Control Module (TCM) for diesel engine applications. The PCM or TCM operates the electrical components to provide refined engagement feel, shift feel, and shift scheduling.

Engine power reaches the transmission by a torque converter with an integral clutch. The 6 forward gears and one reverse gear are obtained from 2 planetary gearsets.

This automatic transmission is a 6-speed electronically controlled transmission with a main control valve body unit with 7 solenoids and a torque converter. Gear selection is achieved by the control of transmission fluid to operate various internal clutches. The PCM or TCM operates the electrical components and provides control of gear selection, shift pressure and torque converter slip.

In the event of a system fault, the PCM or TCM also provides for Failure Mode Effect Management to maintain maximum functional operation of the transmission with a minimum power reduction. In the event of a total loss of control or electrical power, the basic transmission functions P, R, N and D are retained. Also 5th gear is retained by the hydraulic system.