Chevrolet Silverado / GMC Sierra. Service manual — part 880

Fig. 141: Transmission Mounted On Holding Fixture
Courtesy of GENERAL MOTORS CORP.

5. Install J 44723 onto the repair stand. See Special Tools.

6. Attach a sling to the transmission.

7. Attach a hoist to the sling.

8. Raise the transmission to adapter plate J 44723 . See Special Tools.

CAUTION: If the transmission is not secured properly to the adapter

plate, the transmission could fall. To help avoid personal

2008 Chevrolet Silverado 1500

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

Silverado

9. Secure the transmission to J 44723 using either of the PTO mounting pads as the attachment

point. See Special Tools.

10. Remove the sling from the transmission.

TURBINE SPEED SENSOR REMOVAL

injury and/or property damage: Use at least 5 bolts to
support the transmission. Use M10 x 1.5 bolts with 19-25
mm (3/4-1 inch) thread engagement. If the proper bolt is
not used, the PTO bolt holes may be damaged.

2008 Chevrolet Silverado 1500

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

Silverado

Fig. 142: VSS And Bolt
Courtesy of GENERAL MOTORS CORP.

1. Remove the vehicle speed sensor bolt (1) that retains the turbine speed sensor (2) to the

transmission case.

2. Remove the turbine speed sensor (2).

3. Remove the vehicle speed sensor O-ring (3) from the turbine speed sensor.

1-2-3-4-5-6 CLUTCH PISTON HOUSING ASSEMBLY REMOVAL

2008 Chevrolet Silverado 1500

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

Silverado

Fig. 143: Identifying 1-2-3-4, 4-5-6 Clutch Assembly
Courtesy of GENERAL MOTORS CORP.

1. Lift and remove the 1-2-3-4, 4-5-6 clutch piston assembly (1).

2008 Chevrolet Silverado 1500

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

Silverado