Chevrolet Silverado / GMC Sierra. Service manual — part 1122

Fig. 363: Locating Forward Clutch Housing O-Ring Seal
Courtesy of GENERAL MOTORS CORP.

1. Install a new input to forward clutch housing O-ring seal (622).

2008 Chevrolet Silverado 1500

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

Silverado, Sierra & Silverado

Fig. 364: Identifying 3rd & 4th Clutch Piston Inspection Areas
Courtesy of GENERAL MOTORS CORP.

2. Inspect the 3rd and 4th clutch piston (623) for the following conditions:

Porosity or damage

Seal damage

3. Install the 3rd and 4th clutch piston (623) into the input housing.

2008 Chevrolet Silverado 1500

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

Silverado, Sierra & Silverado

Fig. 365: Forward Clutch Housing Inspection Areas
Courtesy of GENERAL MOTORS CORP.

4. Inspect the forward clutch housing (628) for the following conditions:

Proper check ball operation

Damage or distortion

Burrs in the seal areas

Cracks

2008 Chevrolet Silverado 1500

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

Silverado, Sierra & Silverado

Fig. 366: Inspecting Forward Clutch Piston For Damage Or Wear
Courtesy of GENERAL MOTORS CORP.

5. Inspect the forward clutch piston for the following conditions:

Porosity or damage

Seal damage

Apply leg damage

2008 Chevrolet Silverado 1500

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

Silverado, Sierra & Silverado