Chevrolet Silverado / GMC Sierra. Service manual — part 1152

Fig. 472: Locating 3-4 Shift Valve
Courtesy of GENERAL MOTORS CORP.

25. Remove the bore plug retainer (395) and the bore plug (381).

26. Remove the 3-4 shift valve spring (386) and the 3-4 shift valve (385).

CAUTION: Refer to Valve Springs Can Be Tightly Compressed

Caution .

2008 Chevrolet Silverado 1500

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

Silverado, Sierra & Silverado

Fig. 473: Identifying Isolator Valve & Regulator Apply Valve
Courtesy of GENERAL MOTORS CORP.

27. Remove the bore plug retainer (395) and the bore plug (381).

28. Remove the regulator apply valve (380) and the regulator apply spring (397) and the

isolator valve (398).

2008 Chevrolet Silverado 1500

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

Silverado, Sierra & Silverado

Fig. 474: View Of 4-3 Sequence Valve & 3-4 Relay Valve
Courtesy of GENERAL MOTORS CORP.

29. Remove the bore plug retainer (395) and the bore plug (381).

30. Remove the 3-4 relay valve (384) and the 4-3 sequence valve (383) and the 4-3 sequence

valve spring (382).

CONTROL VALVE BODY ASSEMBLE

Inspection Procedure

2008 Chevrolet Silverado 1500

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

Silverado, Sierra & Silverado

Fig. 475: Inspecting Control Valve Body For Channel Witness Marks
Courtesy of GENERAL MOTORS CORP.

1. Inspect the valve body to spacer plate gasket for valve body channel witness marks. The

witness marks should be complete. Incomplete witness marks may be caused by an uneven
case surface. Incomplete witness marks may also be caused by cross-channel leaks.

2. Inspect the valve body casting for the following conditions:

Porosity

Cracks

Damaged machined surfaces

2008 Chevrolet Silverado 1500

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

Silverado, Sierra & Silverado