GM Service Manual Online
For 1990-2009 cars only

Object Number: 599396  Size: SH

Rear axle identification information is stamped on the right side axle tube near the differential housing. The information includes the following:

    â€¢ Broadcast code (1)
    â€¢ Build Source (2)
    â€¢ Build date (3) (Julian date)
    â€¢ Shift built (4)

In order to verify reports made on the rear axle assembly, include full code letters and build date numbers.