Suburban 1/2 Ton 2WD V8-5.3L VIN T (2004)
Wheel Hub (Locking): Technical Service Bulletins
Drivetrain - Gen II Vs. Gen III Wheel Hub Changes
INFORMATION
Bulletin No.: 08-03-08-003A
Date: March 02, 2009
Subject:
Wheel Hub Changes - Gen III vs. Gen II
Models:
2008 and Prior Cadillac Escalade Models
2008 and Prior Chevrolet Avalanche, Silverado, Silverado Classic, Suburban, Tahoe
2008 and Prior GMC Sierra, Sierra Classic, Yukon Models
Supercede:
This bulletin is being revised to update the parts information in the table and to add an Illustrated Hub Gallery depicting all wheel hub part numbers
called out below for visual identification purposes. Please discard Corporate Bulletin Number 08-03-08-003 (Section 03 - Suspension).
General Motors Vehicle Engineering has introduced a new design Gen III front wheel hub for the above listed vehicles that replaces the Gen II product.
These Gen II 4x2 and 4x4 applications that were previously serviced by seven part numbers are now serviced by three Gen III part numbers.
Concerns have been expressed by technicians regarding the use of the new supersessions and whether the Gen III hubs will properly fit the vehicles being
serviced, especially because of visual and functional differences (splines). This bulletin has been developed to address those concerns.
Please refer to the table above for information on the Gen III replacement part for each Gen II application. At the end of the bulletin you will find an
illustrated "Hub Gallery" with graphic depictions of both Gen II and replacement style Gen III parts. Using these illustrations you should be able to
identify both the Gen II and Gen III wheel hubs.
Warning
If replacing wheel studs, please refer to the GM Parts Catalog for the correct stud part number for each application. Different types of studs are used
depending on the wheel hub application.
When replacing an older Gen II design 4x2 hub with a new 4x2/4x4 common Gen III hub, it is acceptable to have a bearing with splines on it for a 4x2
application that previously did not. However, the older Gen II design 4x4 hubs should NOT be used on a 4x2 vehicle. The Gen II 4x4 hub relies on the
tension of the wheel drive shaft joint to hold everything together. The roll form feature on the inboard side of the new 4x2/4x4 Gen III hub eliminates
this concern.
The only hub that is not back serviceable is P/N 15719007 (not pictured) for 1999-2000 C25 applications due to a different hub flange to bearing flange
offset.
Important:
Only the new part numbers referenced in this bulletin are interchangeable between the 4x2 and 4x4 applications with the exception of P/N 15719007
(Not Shown). Under no circumstances should any other 4x4 hub be used in a 4x2 application.
Illustrated Hub Gallery
