Chevrolet Silverado / GMC Sierra. Service manual — part 1146

3. Lubricate NEW O-ring (249) with transmission fluid and position the O-ring as shown.

4. Insert the ISS (250) into oil pump ISS bore and fully seat.

5. Align ISS bolt hole insert with the oil pump mounting hole.

6. Install bolt (247).

Tighten: Tighten the bolt to 9-11 N.m (6.6-8.1 lb ft).

NOTE:

Refer to Fastener Notice .

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis

Silverado, Sierra & Silverado

Fig. 451: Identifying ISS Assembly Wire Harness
Courtesy of GENERAL MOTORS CORP.

7. Route the ISS assembly (250) wire harness as shown. Install harness bracket #1 and #2 in

the locations shown. Ensure the wire harness lays flat against the pump housing.

OIL PUMP ASSEMBLY INSTALLATION

Special Tools

J 25025-1 Dial Indicator Mounting Post

J 36850 Transjel Lubricant. See Special Tools.

J 39855 Stator Shaft Seal Installer. See Special Tools.

Installation

IMPORTANT: Ensure the ISS brackets securley fasten the wiring harness

to the pump housing.

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis

Silverado, Sierra & Silverado

Fig. 452: Installing J 25025-1
Courtesy of GENERAL MOTORS CORP.

1. Install the J 25025-1 .

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis

Silverado, Sierra & Silverado

Fig. 453: View Of 39855-2
Courtesy of GENERAL MOTORS CORP.

2. Remove the J 39855-2 which is part of kit J 39855 . See Special Tools.

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis

Silverado, Sierra & Silverado