GM Service Manual Online
For 1990-2009 cars only
Figure 1:

Automatic Transmission Internal Electronic Components (4L80-E)


Object Number: 1236985  Size: LF
(22a)Automatic Transmission (AT) Input (Shaft) Speed Sensor (ISS) Assembly
(22b)Automatic Transmission (AT) Output (Shaft) Speed Sensor (OSS) Assembly
(34)Automatic Transmission Fluid Temperature (TFT) Sensor
(40)Automatic Transmission Fluid Pressure (TFP) Manual Valve Position Switch
(311)2-3 Shift Solenoid (SS) Valve Assembly
(313)1-2 Shift Solenoid (SS) Valve Assembly
(320)Pressure Control (PC) Solenoid Valve Assembly
(323)Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid Valve Assembly
Figure 2:

Transmission Control Module (TCM)


Object Number: 1861633  Size: MF
(1)Transmission Control Module (TCM)
Figure 3:

Tow/Haul Switch Location


Object Number: 1327929  Size: MF
(1)Tow/Haul Switch