Transmission Components and System

Transmission Component and System Description
The mechanical components of this unit are as follows:
^ A torque converter with a torque converter clutch (TCC)
^ A drive link assembly
^ 4th and Lo/Reverse band assemblies
^ Forward, coast, 2nd and 3rd multiple disc clutches
^ Two planetary gear sets
^ Two sprag clutches, Forward and 2nd
^ One roller clutch, Lo
^ Three fluid pumps
^ Two control valve assemblies
^ A final drive assembly with a bolted on case extension
The electrical components of this unit are as follows:
^ Two shift solenoid valves, 1-2 and 2-3
^ A torque converter clutch pulse width modulated (TCC PWM) solenoid valve
^ A transmission pressure control (PC) solenoid valve
^ An automatic transmission fluid temperature (TFT) sensor
^ Two speed sensors: input and vehicle speed sensor
^ An automatic transmission internal mode switch (IMS)
^ An automatic transmission fluid pressure (TFP) manual valve position switch
^ An automatic transmission wiring harness
^ An automatic transmission wiring extension harness

Dry Sump Oil System
This transmission uses a dry sump method of operation. There is no reservoir of fluid in the bottom pan during operation. The majority of fluid remains in the side pan. Fluid is continuously supplied from the bottom pan to the upper valve body. The upper valve body distributes fluid to the necessary components. The three pumps operate in the following manner:
^ Scavenger Pump -This pump continuously supplies fluid to the side pan by scavenging oil from the bottom pan.
^ Primary Pump - This pump operates on fluid from the scavenger pump and supplies line pressure for all gear ranges.
^ Secondary Pump - During demand driving situations such as forced throttle downshifts, wide open throttle upshifts, and Reverse, this pump helps the primary pump to reach the boosted line pressures that are needed. The secondary pump also helps supply the fluid capacity to the necessary clutches during initial engagement.