GM Service Manual Online
For 1990-2009 cars only

Object Number: 640630  Size: SH

Front axle identification information is stamped on the top of the differential carrier assembly. The information includes the following:

    • Broadcast code (1)
    • Supplier code (2)
    • Date built (3)
    • Shift built (4) - Optional for 8.25 and 9.25 inch axles
    • Hour built (5)

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