Chevrolet Silverado / GMC Sierra. Manual - part 960
CONTROL VALVE BODY CLEANING AND INSPECTION
Clean and Inspect
1. Clean all removed parts with volatile mineral spirits or other similar cleaning agent.
2. Clean fluid passages by working a piece of soft wire through the passage and flushing with
mineral spirits. Dry the passages with compressed air.
3. Inspect valves for wear, nicks, or scratches. Remove minor imperfections with a soft stone
or crocus cloth. Replace any damaged valves.
4. Inspect springs for signs of overheating, permanent set, or wear. Replace suspect springs.
5. Inspect mating surfaces for nicks, burrs, scratches, or foreign matter. Remove any defects
with crocus cloth or a soft stone. Replace damaged parts.
6. Inspect bores for wear, scratches, and grooves. Remove scratches and burrs with crocus
cloth. Replace deeply grooved or scratched parts.
7. Inspect threaded parts for burred or damaged threads. Remove burrs with a soft stone or fine
file.
8. Inspect threaded openings for damaged threads. Correct damaged threads with a correctly
sized tap.
Pressure Control Solenoid 1 (PCS1)/PSC2 and the Torque Converter Clutch (TCC) PCS Retaining Bracket Inspection
Inspection
NOTE:
Refer to Transmission Control Valve Body Overhaul Notice .
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
Fig. 402: Inspecting Retaining Bracket Angles
Courtesy of GENERAL MOTORS CORP.
1. Measure the angle between the surfaces of the PCS1/PCS2 retaining bracket (1), and the
TCC PCS retaining bracket (2), as shown in insert, angle A.
2. Adjust the bracket surfaces until the angle between the surfaces is 82.84 degrees.
SHIFT SOLENOID VALVE DISASSEMBLE
Tools Required
J 33163 Valve Tray Set. See Special Tools.
J 43773 Valve Spring Compressor. See Special Tools.
Disassemble
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
Fig. 403: Compressing Shift Solenoid Shift Valve Spring
Courtesy of GENERAL MOTORS CORP.
1. Using J 43773 (2), compress the shift valve 1 (SV1) spring until the retaining clip (1) is
loose. See Special Tools.
2. Remove the clip.
IMPORTANT: To help prevent confusing parts on reassembly, use J 33163
to store the removed shift valve body assembly valves,
springs, and stops. See Special Tools.
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
