Chevrolet Silverado / GMC Sierra. Service manual — part 1138

Fig. 420: Identifying Oil Pump Rotor & Pump Vane Rings
Courtesy of GENERAL MOTORS CORP.

3. Remove the oil pump rotor (212) and pump vane rings (210).

4. Remove the pump vanes (213).

2008 Chevrolet Silverado 1500

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

Silverado, Sierra & Silverado

5. Remove the rotor guide (211).

Fig. 421: Identifying Oil Pump Slide, Pump Slide Support Seal & Pump Slide Seal
Courtesy of GENERAL MOTORS CORP.

6. Remove the pump slide (203), pump slide support seal (208) and the pump slide seal (209).

7. Remove the slide seal back-up O-ring seal (202) and the oil seal - slide to wear plate, ring

(201).

8. Remove the pivot slide pin (205) and the pivot pin spring (204).

2008 Chevrolet Silverado 1500

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

Silverado, Sierra & Silverado

OIL PUMP ROTOR AND SLIDE MEASUREMENT

Fig. 422: Measuring Oil Pump Rotor & Slide
Courtesy of GENERAL MOTORS CORP.

Refer to Oil Pump Rotor and Slide Measurement .

Measure the oil pump rotor (212) thickness.

Measure the oil pump slide (203) thickness.

OIL PUMP BODY BUSHING REPLACEMENT

Tools Required

IMPORTANT: Measure the rotor and slide thickness for surface wear. The

rotor and slide measurements must both fall into the same
thickness range. If the rotor and slide measurements do not
fall into the same thickness range, or are outside of all the
ranges, the oil pump must be replaced as an assembly.

2008 Chevrolet Silverado 1500

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

Silverado, Sierra & Silverado

J 41778-1 Pump Body Bushing Installer/Remover. See Special Tools.

J 41778-2 Pump Body Bushing Position Stop. See Special Tools.

Replacement

Fig. 423: Inspecting Oil Pump Body
Courtesy of GENERAL MOTORS CORP.

1. Inspect the oil pump body for the following:

Worn or damaged bushings

Foreign material or debris

Porosity

Scored or irregular mating faces

Cross channel leaks

2008 Chevrolet Silverado 1500

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

Silverado, Sierra & Silverado