Chevrolet Silverado / GMC Sierra. Manual — part 966

Fig. 425: View Of Main Valve Body Locating Pins
Courtesy of GENERAL MOTORS CORP.

1. Remove the locating pin from the main valve body.

2. Place a new locating pin into J 43779 (3). See Special Tools.

NOTE:

DO NOT mar the main valve body surface when installing the
locating pin(s). Tap gently on the locating pin installer tool.
Heavy or continued hammering will damage the transmission
case surface.

IMPORTANT: The main valve body has 5 locating pins that can be

replaced. Do not replace a locating pin unless the pin is
damaged.

2008 Chevrolet Silverado 1500

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

Silverado

3. Install J 43779 with the locating pin into the locating pin hole. See Special Tools.

4. Gently tap J 43779 until. See Special Tools.J 43779 touches the main housing surface. See

Special Tools.

Specification: The locating pin installed height is 10.7-11.3 mm (0.42-0.44 in) above the
main valve body surface.

MAIN VALVE BODY ASSEMBLE

Tools Required

J 33163 Valve Tray Set. See Special Tools.

J 43773 Valve Spring Compressor. See Special Tools.

Assemble

2008 Chevrolet Silverado 1500

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

Silverado

Fig. 426: Locating Exhaust Pressure Regulator Valve & Spring
Courtesy of GENERAL MOTORS CORP.

1. Install the exhaust pressure regulator valve (1) and spring (2).

IMPORTANT: To prevent confusing parts during assembly, the removed

valves, springs, and stops are stored in J 33163 . See Special
Tools.

2008 Chevrolet Silverado 1500

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

Silverado

Fig. 427: Compressing Exhaust Pressure Regulator Valve Spring
Courtesy of GENERAL MOTORS CORP.

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

3. Install the retaining clip (1).

4. 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