Chevrolet Silverado / GMC Sierra. Manual - part 903
1. Inspect the bushing for damage and wear. The bushing must not be damaged or worn.
2. Measure the ID of the bushing. Replace the pump bushing if the ID exceeds specifications.
Specification: The bushing maximum ID is 58.458 mm (2.3015 in).
Fig. 216: Driving Bushing From Pump Body
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
Courtesy of GENERAL MOTORS CORP.
3. Remove all gears from the pump body (1).
4. Support the pump body (1), machined surface up, on 2 wooden blocks so that the bushing
(2) can be removed from the back of the pump body.
5. Install the longer end of J 43771 into the bushing. See Special Tools.
6. Press or drive the bushing (2) from the pump body (1).
7. Clean the bushing bore of all residue. All of the parts must be dry before installing the
bushing.
IMPORTANT: The preferred method of removing or installing the bushing
is with tool J 43771 and a press. See Special Tools. If a press
is not available use J 43771 and. See Special Tools.J 8092 .
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
Fig. 217: Locating Oil Pump Body & Bushing
Courtesy of GENERAL MOTORS CORP.
IMPORTANT: The bushing may be orientated in any position, but the
preferred orientation is with the bushing split joint aligned
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
8. Support the pump body (1), machined surface down, on 2 wooden blocks.
9. Install the bushing (2) onto the shorter end of J 43771 . See Special Tools.
10. Apply Loctite® #620, or equivalent, to the bushing bore.
11. Using J 43771 , press or drive the bushing into the pump body until J 43771 seats. See
Special Tools.
OIL PUMP LOCATING PIN REPLACEMENT
Tools Required
J 43779 Locating Pin Installer. See Special Tools.
Replacement
with the casting numbers and the centerline of the boss
opposite the numbers. Position the split joint away from the
boss.
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado