Chevrolet Silverado / GMC Sierra. Manual — part 888

Fig. 166: Control Valve Body Assembly
Courtesy of GENERAL MOTORS CORP.

6. Lift the control valve body assembly (2) until the 2 locating pins (1) of the control valve

body assembly are disengaged from the transmission case.

IMPORTANT: Do not drop the manual valve when removing or installing the

control valve body assembly onto or from the transmission
case.
Placing a finger over the end of the manual valve hole when
removing the control valve body assembly from the
transmission case prevents the manual valve from falling
free of the bore.

2008 Chevrolet Silverado 1500

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

Silverado

Fig. 167: Detent Lever/IMS Assembly
Courtesy of GENERAL MOTORS CORP.

7. Slide the control valve body assembly to the side and disengage the manual valve pin (2)

from the manual shift shaft detent lever/IMS assembly (1).

8. Remove the control valve body assembly from the transmission case.

2008 Chevrolet Silverado 1500

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

Silverado

Fig. 168: Manual Valve And Pin
Courtesy of GENERAL MOTORS CORP.

9. Remove, as a unit, the manual valve (2) and the manual valve pin (3) from the shift valve

body assembly (1).

10. Remove the manual valve pin (3) from the manual valve (2).

2008 Chevrolet Silverado 1500

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

Silverado