Chevrolet Silverado / GMC Sierra. Manual — part 887
Fig. 162: Identifying Main valve Body Solenoids, Switches & Harness
Courtesy of GENERAL MOTORS CORP.
2. Disconnect the internal wiring harness (2) from the following components:
Pressure control solenoid 1 (PCS1) (7)
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
PCS2 (6)
Shift solenoid 3 (SS3) (5)
SS2 (4)
Torque converter clutch (TCC) PCS (3)
SS1 (8).
Transmission fluid pressure (TFP) switch (9)
Modulated main pressure solenoid (11)
Transmission internal mode switch (IMS)
3. Remove the solenoid retainers (1) from SS2 (4) and SS3 (5).
4. Remove the internal wiring harness (2) from main valve body (10).
5. Install the solenoid retainers (1).
CONTROL VALVE ASSEMBLY REMOVAL
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
Fig. 163: Manual Shift Shaft Detent Spring
Courtesy of GENERAL MOTORS CORP.
1. Remove 2 detent spring bolts (1).
2. Remove the manual shift shaft detent spring (2).
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
Fig. 164: Control Valve Assembly Bolts
Courtesy of GENERAL MOTORS CORP.
3. Remove 11 control valve body assembly bolts (1).
4. Remove 4 bolts (2) from the modulated main valve body and control valve body.
IMPORTANT: Six gold colored bolts retain the modulated main valve body.
Four of these bolts assist in retaining the control valve body.
The modulated main valve body is removed as part of the
control valve assembly disassemble procedure.
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
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