Overhaul Automatic Transmission: Description

The 5R55W/S is an electronically controlled 5-speed automatic transmission. Transmission has the following features: a 4-element torque converter with Torque Converter Clutch (TCC), 3 compound planetary gear sets, 3 bands, 3 multi-plate clutches and 2 one-way clutches. The letter "S" within transmission code describes a synchronous shift transmission. The letter "W" within transmission code describes a wide ratio transmission.

Powertrain Control Module (PCM) controls transmission operation through 4 On/Off solenoids for shifting, one Pulse-Width Modulated (PWM) solenoid for Torque Converter Clutch (TCC) control and 3 Pressure Control (PC) solenoids (PC-A, PC-B and PC-C) for line pressure control, band and clutch application pressure. PCM has built-in self-diagnosis, fail-safe operations mode, and warning code display for the main input sensors and solenoid valves.

Input signals from sensors are sent to PCM. PCM can determine when the time and conditions are right for a shift or converter clutch application.