Chevrolet Silverado / GMC Sierra. Manual — part 899

Fig. 202: Locating Oil Pump Assembly Retaining Bolts
Courtesy of GENERAL MOTORS CORP.

10. Remove 5 bolts (4) retaining the oil pump assembly (1) to the oil pump cover assembly (3).

11. Separate the oil pump cover assembly (3), the torque converter housing to case channel

plate (2), and the oil pump assembly (1).

TRANSMISSION FLUID PRESSURE TEST HOLE PLUG, EXTERNAL FILTER, AND FLUID
COOLER PIPE RETAINER REMOVAL

Tools Required

J 45023 Control Main Filter Wrench. See Special Tools.

Removal

IMPORTANT: Do not damage the torque converter housing to case channel

plate when separating the oil pump cover assembly, torque
converter housing to case channel plate, and oil pump
assembly.

2008 Chevrolet Silverado 1500

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

Silverado

Fig. 203: Locating Transmission External Oil Filter & Adapter
Courtesy of GENERAL MOTORS CORP.

1. Remove the transmission line pressure test hole plug (5).

2. Remove the O-ring (4) from the pressure test hole plug (5).

3. Using J 45023 (9) or a filter strap wrench, remove the transmission external oil filter (8).

See Special Tools.

4. Remove the magnet (7) from the transmission external oil filter adapter (6) or from the

2008 Chevrolet Silverado 1500

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

Silverado

external oil filter (8).

5. Remove the transmission external oil filter adapter (6).

6. If present, remove both transmission oil cooler pipe connector hydraulic assemblies (2).

7. Remove the O-rings (3) from the hydraulic assemblies.

OIL PUMP DISASSEMBLE

2008 Chevrolet Silverado 1500

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

Silverado