Introduction General Motors THM 4L60-E.
This booklet contains general description and the procedures necessary to repair, overhaul, or service the new THM 4L60-E electronic automatic overdrive transmission. The 4L60-E is a fully automatic rear wheel drive transmission. This unit is basically a THM 700-R4 with electronic controls added to the valve body. The shift pattern is controlled electronically with 2 shift solenoids that recieve a ground signal from the Powertrain Control Module (PCM). The PCM will vary shift points, as it is constantly interpreting numerous electronic signals from various operational sensors located on the vehicle.
The PCM also controls the apply and release of the Torque Converter Clutch (TCC). This transmission also recieved another PWM solenoid in 1995 to control TCC apply feel. Line pressure and shift feel are controlled electronically with a Pressure Control Solenoid (PCS), located on the valve body and dependent on TPS and VSS signals.
Note: There have been many engineering changes in this transaxle since its introduction in 1993. ATSG
also has available an THM 4L60-E “Update Handbook” which includes the many changes and is required along with this manual for a proper overhaul or repair.
- APPLICATION AND SOLENOID CHART
- INTERNAL ELECTRONIC CONTROLS
- SHIFT SPEED CHART
- LINE PRESSURE CHECK
- TROUBLE SHOOTING CHARTS
- DIAGNOSTIC TROUBLE CODES
- WIRING SCHEMATIC
- TRANSMISSION DIS-ASSEMBLY
- TRANSMISSION RE-ASSEMBLY
- UPDATED LOW REVERSE PISTON
- UPDATED PRESSURE REGULATOR VALVE
- SPACER PLATE SCREEN LOCATIONS
- CHECKBALL LOCATIONS
- CHECKING PRESSURE SWITCH ASSEMBLY
- MODEL APPLICATION CHART
- UPDATED OIL FILTER SEAL
- TORQUE SPECIFICATIONS
- SOLENOID RESISTANCE CHART
- SPECIAL TOOLS
Size: 4.11 Mb
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