Transmission Component and System Description

WARNING: This page is about a different car, the 2004 GMC Sierra and 2004 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.

The mechanical components of the 4L60-E are as follows:

A torque converter with an electronically controlled capacity clutch (ECCC)
This transmission is equipped with an ECCC. The pressure plate does not fully lock to the torque converter cover. Instead, the pressure plate maintains a small amount of slippage, about 20 RPM, in SECOND, THIRD, and FOURTH gears, depending on the vehicle application. ECCC was developed to reduce the possibility of noise, vibration, or chuggle caused by TCC apply. Typical apply speeds are 49-52 km/h (30-32 mph) in THIRD gear and 65-73 km/h (40-45 mph) in FOURTH gear. Full lockup is available at highway speeds on some applications.
Torque converter assembly
Servo assembly and 2-4 band assembly
Reverse input clutch and housing
Overrun clutch
Forward clutch
3-4 clutch
Forward sprag clutch assembly
Lo and reverse roller clutch assembly
Lo and reverse clutch assembly
Two planetary gear sets: Input and Reaction
Oil pump assembly
Control valve body assembly

The electrical components of the 4L60-E are as follows:

1-2 and 2-3 shift solenoid valves
3-2 shift solenoid valve assembly
Transmission pressure control (PC) solenoid
Torque converter clutch (TCC) solenoid valve
TCC pulse width modulation (PWM) solenoid valve
Automatic transmission fluid pressure (TFP) manual valve position switch
Automatic transmission fluid temperature (TFT) sensor
Vehicle speed sensor assembly
Secondary fluid pump (M33 Only)

For more information, refer to Electronic Component Description (M30/M32) or Electronic Component Description (M33 Only) .