IDENTIFICATION
The 4L60-E transmission can be identified by a letter code contained in identification number. Identification number is stamped on transmission case above oil pan rail on right rear side, or to rear of oil pan. (Scheme 13) Identification number contains information which must be used when ordering replacement parts. Transmission RPO code is M30.
Scheme 13
DESCRIPTION
The 4L60-E is a fully automatic transmission consisting of a 3-element hydraulic torque converter with a Torque Converter Clutch (TCC). The 4-speed transmission is equipped with 2 planetary gear sets, 5 multiple-disc clutches, one sprag clutch, one roller clutch and a 2-4 band. (Scheme 14)
A hydraulic system, pressurized by a variable capacity vane type oil pump, provides pressure required to operate friction elements and automatic controls. The 4L60-E also contains electronic solenoids to control hydraulic operations. A Powertrain Control Module (PCM) receives signals from Vehicle Speed Sensor (VSS), Throttle Position (TP) Sensor, fluid pressure switch assembly, and temperature sensor. These signals help PCM determine when to switch 2 shift solenoids, 3-2 downshift solenoid, and/or TCC solenoid on or off. PCM can also control line pressure via pressure control solenoid (force motor).
