Chevrolet Silverado / GMC Sierra. Manual - part 899
Washer
Courtesy of GENERAL MOTORS CORP.
7. Remove 3 overlap seal rings (6) from the rear hub of the oil pump cover module.
8. Remove 2 overlap seal rings (1, 2) from the stator shaft (3).
9. Remove the thrust washer (5).
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
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