Chevrolet Silverado / GMC Sierra. Service manual — part 1078

Fig. 201: View Of VSS, Bolt & O-Ring Seal
Courtesy of GENERAL MOTORS CORP.

3. Remove the VSS bolt (2).

4. Remove the VSS (1).

5. Remove the O-ring seal (3).

Installation Procedure

2008 Chevrolet Silverado 1500

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

Silverado, Sierra & Silverado

Fig. 202: View Of VSS, Bolt & O-Ring Seal
Courtesy of GENERAL MOTORS CORP.

1. Install the O-ring seal (3) onto the VSS (1).

2. Coat the O-ring seal (3) with a thin film of transmission fluid.

3. Install the VSS (1).

4. Install the VSS bolt (2).

Tighten: Tighten the bolt to 11 N.m (97 lb in).

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. 203: View Of Transmission Harness 20-Way Connector & VSS Electrical
Connector
Courtesy of GENERAL MOTORS CORP.

5. Connect the VSS electrical connector (2).

6. Lower the vehicle.

7. Refill the fluid as required.

TRANSMISSION MOUNT INSPECTION

NOTE:

In order to avoid oil pan damage and possible engine failure, insert
a block of wood that spans the width of the oil pan bottom between
the oil pan and the jack support.

2008 Chevrolet Silverado 1500

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

Silverado, Sierra & Silverado

1. Raise the transmission/transaxle in order to remove the weight from the

transmission/transaxle mount and create slight tension in the rubber.

2. Observe the transmission/transaxle mount while raising the transmission/transaxle. Replace

the transmission/transaxle mount if the transmission/transaxle mount exhibits any of the
following conditions:

The hard rubber surface is covered with heat check cracks.

The rubber is separated from the metal plate of the transmission/transaxle mount.

The rubber is split through the center of the transmission/transaxle mount.

3. If there is movement between the metal plate of the transmission/transaxle mount and its

attaching points, lower the transmission/transaxle on the transmission/transaxle mount.
Tighten the bolts or nuts attaching the transmission/transaxle mount to the frame or
transmission/transaxle mount bracket.

TRANSMISSION MOUNT REPLACEMENT (2WD)

IMPORTANT: Black paint on the rubber will crack with time, this does

no constitute a failure.

2008 Chevrolet Silverado 1500

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

Silverado, Sierra & Silverado