Removal & Installation
Before servicing the vehicle, refer to the Precautions Section.
NOTEDisconnecting the negative battery cable on some vehicles may interfere with the functions of the on-board computer systems and may require the computer to undergo a relearning process, once the negative battery cable is reconnected.
NOTEIf working near and/or around the SRS system and components, be sure to properly disable the SRS system. See disarming/arming the SRS system.
NOTEFor vehicles equipped with OnStar (RPO UE1), with battery backup, the backup battery is a redundant power supply to allow limited ONStar functionality in the event of a main battery power disruption to the OnStar module (VCIM). Do not disconnect the main vehicle battery or remove the OnStar fuse with the ignition key in any position other than OFF. Retained accessory power should be allowed to time out or be disabled by opening the driver-s side door before disconnecting power. Disconnecting power to the module in any way while the ignition is ON or with the retained accessory power activated may cause activation of the OnStar backup battery system and will discharge and permanently damage the backup battery. Once the backup battery is activated it will stay on until it has completely discharged. The backup battery is not rechargeable and once it is activated, it must be replaced.
- Disconnect the negative battery cable.
- Raise and safely support the vehicle.
- Matchmark and remove the driveshaft.
- Check and record the preload with an inch pound torque wrench. This will give a combined pinion bearing, carrier bearing, axle bearing and seal preload.
Remove the pinion shaft nut and washer.
NOTEPosition a catch pan under the component to catch gear oil. Be sure to properly dispose of used gear oil.
- Remove the pinion flange.
Remove the oil seal by driving it out of the carrier with a blunt chisel. Do not damage the carrier.
- Installation is the reverse of the removal procedure.
- Be sure to coat the new seal with seal lubricant, part number 1050169, or equivalent.
- While holding the pinion flange tighten the retaining nut gradually and turn the drive pinion several revolutions after each tightening to set the bearings. Check the preload of the bearings each time with an inch pound torque wrench until preload is 3-5 inch lbs more than the reading recorded in the removal procedure.
- Using the GM diagnostic scan tool or aftermarket equivalent reprogram the necessary systems and components. Be sure to follow the scan tool manufacturer-s directions.