Auxiliary Pump Replacement

Auxiliary Pump Replacement (5.3L Engine w/RPO HP2)

Removal Procedure

Caution: When the transmission is at operating temperatures, take necessary precautions when removing the drain plug, to avoid being burned by draining fluid.





1. Raise and suitably support the vehicle. Lifting and Jacking the Vehicle.
2. Place a drain pan under the transmission oil pan.
3. Remove the drain plug, if equipped.
4. If necessary, remove the bolts and position aside the range selector cable bracket for clearance while lowering the pan. It is not necessary to remove the cable from the lever or bracket.
5. Remove the oil pan bolts from the front and sides of the pan only.
6. Loosen the rear oil pan bolts approximately 4 turns.
7. Lightly tap the oil pan with a rubber mallet in order to loosen the pan to allow the fluid to drain.





8. Remove the oil pan bolts.
9. Remove the oil pan and gasket. Discard the old gasket.





10. Disconnect the auxiliary oil pump electrical connector.





11. Remove the auxiliary oil pump bolts.
12. Remove the auxiliary pump.

Installation Procedure





1. Install the auxiliary pump.

Notice: Refer to Fastener Notice in Service Precautions.

2. Install the auxiliary oil pump bolts.
^ Tighten the bolts to 10 Nm (89 inch lbs.).





3. Connect the auxiliary oil pump electrical connector.





4. Install the oil pan and a NEW gasket.
5. Install the oil pan bolts.
^ Tighten the bolts alternately and evenly to 11 Nm (97 inch lbs.).
6. If previously removed, install the range selector cable bracket and bolts.
^ Tighten the bolts to 25 Nm (18 ft. lbs.).
7. Apply a small amount of sealant GM P/N 12346004 (Canadian P/N 10953480), or equivalent to the threads of the oil pan drain plug, if equipped.
8. Install the oil pan drain plug, if equipped.
^ Tighten the plug to 18 Nm (13 ft. lbs.).
9. Refill the transmission with fluid.