Chevrolet Silverado / GMC Sierra. Manual — part 858

2. If the vehicle is equipped with a diesel engine, the transmission must be removed to service

the fill tube and/or seal. Refer to Transmission Replacement.

3. Remove the transmission fluid level indicator.

4. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle .

5. Remove the heat shield. Refer to Transmission Heat Shield Replacement.

6. Remove the fill tube nuts.

7. Place a drain pan under the transmission to catch any dripping fluid.

8. Loosen the fill tube from the transmission.

9. Remove the fill tube and seal from the vehicle.

2008 Chevrolet Silverado 1500

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

Silverado

Fig. 64: Fill Tube Plug & Seal
Courtesy of GENERAL MOTORS CORP.

10. Remove the fill tube plug (1).

11. Remove the fill tube plug seal (2).

Installation Procedure

Fig. 65: Fill Tube Plug & Seal
Courtesy of GENERAL MOTORS CORP.

1. Install a new fill tube plug seal (2) into the main housing.

2008 Chevrolet Silverado 1500

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

Silverado

2. Align the tab on the fill tube plug (1) with the tang on the main housing.

3. Install the fill tube plug (1). Press the plug into the seal (2) until the tab on the fill tube plug

locks into place in the notch on the main housing.

Fig. 66: Fill Tube Nuts

2008 Chevrolet Silverado 1500

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

Silverado

Courtesy of GENERAL MOTORS CORP.

4. Install a NEW fill tube seal.

5. Install the fill tube. Ensure that the fill tube bracket is positioned properly on the studs.

6. Install the fill tube nuts.

Tighten: Tighten the nuts to 18 N.m (13 lb ft).

7. Install the heat shield. Refer to Transmission Heat Shield Replacement.

8. Lower the vehicle.

9. Fill the transmission to the proper level with approved fluid.

SPEED SENSOR REPLACEMENT

Removal Procedure

NOTE:

Refer to Fastener Notice .

2008 Chevrolet Silverado 1500

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

Silverado