GM Service Manual Online
For 1990-2009 cars only

All axle housings have identification tags or identification information stamped on them. There are two manufactures:

Eaton® Rear Axle ID


Object Number: 200579  Size: SF
(1)Axle Specification Number
(2)Casting Number
(3)Rough Number
(4)Capacity
(5)Housing Subassembly Number (Including Tubes)

Dana/Spicer® Rear Axle Differential Carrier ID


Object Number: 200587  Size: SH
(1)Dana® Part Number
(2)Customer Part Number (Optional)
(3)Julian Date Code
(4)Line Set Number (Optional)
(5)Last Six Digits of Vehicle Serial Number (Optional)

Record all of the information on these tags in order to help identify the axle assembly.

Dana/Spicer® Rear Axle ID


Object Number: 200582  Size: SH
(1)Dana® Part Number
(2)Customer Part Number (Optional)
(3)Model
(4)Julian Date Code
(5)Line Set Number (Optional)
(6)Last Six Digits of Vehicle Serial Number (Optional)