Chevrolet Silverado / GMC Sierra. Manual — part 963

1. Install the shift solenoid screen (1).

2. Measure the screen installation depth at dimension A.

Specification: The screen installed depth is 0.50-1.0 mm (0.020-0.039 in) below the shift
valve body surface as shown.

Fig. 413: Spring And Control Main Valve
Courtesy of GENERAL MOTORS CORP.

3. Install the control main valve (1) and the control main spring (2).

Tools.

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &

Silverado

Fig. 414: Compressing Control Main Valve Spring
Courtesy of GENERAL MOTORS CORP.

4. Compress the spring with J 43773 (2). See Special Tools.

5. Install the retaining clip (1).

6. Make sure the retaining clip is below the valve body surface.

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &

Silverado

Fig. 415: View Of Plug, Spring, And Shift Valve
Courtesy of GENERAL MOTORS CORP.

7. Install shift valve 2 (SV2) (1), spring (2), and plug (3).

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &

Silverado

Fig. 416: Compressing Shift Valve Spring
Courtesy of GENERAL MOTORS CORP.

8. Compress the spring with J 43773 (2). See Special Tools.

Install the retaining clip (1).

9. Make sure the retaining clip is below the valve body surface.

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &

Silverado