Transmission Operation Overview

WARNING: This page is about a different car, the 2017 Lincoln Navigator and 2017 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.

Transmission operation is controlled by the PCM.

Torque Converter

This transmission uses a torque converter with the following elements:

Impeller
Turbine
Reactor
Torque Converter Clutch (TCC)

For component information, refer to Torque Converter .

Planetary Gearsets

Operation of this transmission involves the use of 2 planetary gearsets that have the following components:

Front (single planetary gearset)
- One sun gear
- One planetary carrier with 4 gears
- One ring gear
Rear (ravigneaux planetary gearset)
- Two sun gears of different sizes
- Three short planetary gear pinions meshing with the sun gears
- Three long planetary gear pinions meshing with the sun gears
- One planetary carrier
- One ring gear

Apply Clutches

This transmission uses the following clutches to operate the 2 planetary gearsets:

Forward clutch (A)
Direct clutch (B)
Intermediate clutch (C)
Low/reverse clutch (D)
Overdrive clutch (E)
Low One-Way Clutch (OWC)

For information about planetary gearsets or the apply clutches, refer to Mechanical Components and Functions .

Hydraulic System

The hydraulic operation of this transmission includes the following components:

Main control assembly
Pump assembly with filter
Torque converter
Apply components (clutches)

For component information, refer to Hydraulic System .

Electronic Operation

The PCM controls the operation of this transmission with the following solenoids:

Line Pressure Control (LPC) solenoid
Shift Solenoid A (SSA)
Shift Solenoid B (SSB)
Shift Solenoid c (SSC)
Shift Solenoid d (SSD)
Shift Solenoid e (SSE)
TCC solenoid

For solenoid information, refer to Transmission Electronic Control System .