I know the n-bodys have alot of wheel bearing issues. There is a new "improved" axle nut to help imply a more consitant load on the bearing to prolong the life.
Here is the TSB:
File In Section: 04 - Driveline Axle
Bulletin No.: 03-04-18-001
Date: February, 2003
INFORMATION
Subject:
Availability of New Front Drive Axle Nut
Models:
1997-2003 Chevrolet Malibu
1999-2003 Oldsmobile Alero
1999-2003 Pontiac Grand Am
This bulletin is to inform dealers that a new and improved front drive axle nut has been released for service of the above listed vehicles.
Use the new nut, P/N 10289657, whenever the front drive axle nut is removed. This new nut is a torque prevailing nut and is silver in color. The old nut is black in color and has a sheet metal cage around the nut (shown below). Using the new nut will provide a more consistent clamp load on the wheel bearing and should help prolong the bearing life.
Notice: Use the correct tightening specifications when installing fasteners in order to avoid damage to parts and systems.
Torque
Tighten the new nut to 235 N.m (173 lb ft).
The old nut torque was 385 N.m (284 lb ft).
Important: Some front wheel hub kits may have the old style nut included in the kit. Discard the old nut and use the new nut, P/N 10289657.
New Style Nut
The nut shown is a torque prevailing nut and is silver colored.
Old Style Nut
The old style nut shown is black and has a sheet metal cage around the nut.
Parts Information
Parts are currently available from GMSPO.
Disclaimer
Threaded Mode