THM 4L80-E – ATSG (Automatic Transmission Service Group)

THM

This booklet contains general description and the procedures necessary to repair, overhaul, or service the THM 4L80-E electronic overdrive automatic transmission. The THM 4L80-E is a fully automatic rear wheel drive transmission. It provides Park, Reverse, Neutral, and four forward speeds with 4th gear being overdrive.

The shift pattern is controlled electronically with two solenoids that recieve a ground signal from the Powertrain Control Module (PCM). The PCM will vary shift points and shift feel, as it is constantly interpreting numerous electronic signals from various operational sensors located on the vehicle. The PCM also controls the Torque Converter Clutch (TCC) apply speed, apply feel, and the release electronically with a solenoid.

Line pressure and shift feel are also controlled electronically with a Pressure Control Solenoid (PCS) located on the valve body. This function is also controlled by the PCM and the numerous electronic signals from the sensors.

POWERFLOW CHART AND SHIFT SOLENOID PATTERN
SHIFT SPEED CHART
LINE PRESSURE TESTS
TROUBLE SHOOTING CHARTS
OIL PASSAGE IDENTIFICATION
CHECK BALL LOCATIONS
1991-92 WIRING SCHEMATIC
TRANSMISSION DISASSEMBLY
TRANSMISSION ASSEMBLY PROCESS
THRUST BEARING LOCATIONS
TROUBLE CODE DESCRIPTION
TORQUE SPECIFICATIONS
UPDATED WIRE HARNESS AND CASE CONNECTOR FOR 1993
UPDATED ELECTRONICS FOR 1994
UPDATED CENTER LUBE SYSTEM FOR 1997
UPDATED MANUAL 2ND BAND FOR 1999
UPDATED OVERRUN CLUTCH FOR 2001

Language: English
Format: PDF
Pages: 120

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THM 4L80-E – ATSG (Automatic Transmission Service Group)

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