Chevrolet Silverado / GMC Sierra. Service manual — part 862

4. Install the front heat shield bolts (2).

Tighten: Tighten the bolts (2) to 17 N.m (13 lb ft).

5. Lower the vehicle.

CONTROL VALVE BODY REPLACEMENT

Tools Required

J 44247 Internal Wiring Harness Installer. See Special Tools.

J 44257 Main Wiring Harness Connector Remover

Removal Procedure

2008 Chevrolet Silverado 1500

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

Silverado

Fig. 77: Transmission Rear Electrical Connector
Courtesy of GENERAL MOTORS CORP.

1. Disconnect the external wiring harness from the transmission main connector. Use J 44257

if the connector is not easily accessible.

2. Remove the oil pan and transmission internal oil filter. Refer to Oil Pan Replacement.

CAUTION: Refer to BATTERY DISCONNECT CAUTION .

2008 Chevrolet Silverado 1500

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

Silverado

Fig. 78: Placing 30 mm 12-Point Deep Socket Or Box-End Over Connector
Courtesy of GENERAL MOTORS CORP.

3. Place a 30 mm (1 3/16 in) 12-point deep socket or box-end (2) over the connector (1).

4. Push inward on the socket or wrench to release the retainer feet that attach the connector (1)

to the transmission case.

5. Remove the wrench. Push inward on the electrical connector to separate it from the

transmission case. This allows the internal wiring harness to remain with the control valve
assembly when removed.

IMPORTANT: The transmission main connector is actually one end of the

internal harness that protrudes through the transmission
case.

2008 Chevrolet Silverado 1500

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

Silverado

Fig. 79: Detent Spring Assembly
Courtesy of GENERAL MOTORS CORP.

6. Remove the 2 detent spring bolts (3). Remove the detent spring assembly (2).

7. Disconnect the internal wiring harness from the detent lever/IMS assembly.

2008 Chevrolet Silverado 1500

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

Silverado