Case Extension Install/Final Drive End Play Check

Case Extension Install/Final Drive End Play Check

Special Tools
* J 25025-7A - Dial Indicator Post
* J 28585 - Snap Ring Remover
* J 8001 - Dial Indicator

For equivalent regional tools, refer to Special Tools (Tools and Equipment).




1. Inspect the case to case extension seal (126).
2. Inspect the case extension mating surface for damage.




3. Install the following parts:

* The selective washer (133)
* The thrust washer (132)
* The case extension seal (126)
* The case extension (134)




4. Apply pip thread sealant GM P/N 12346004 to bolt threads before installation. Install the case extension bolts (128, 129).
5. Hand tighten bolts (128, 129) until case extension (134) is seated onto case.





Caution: Failure to ensure that proper end play clearance exists, could lead to internal component damage.

6. Install the long J 25025-7A - dial indicator post and the J 8001 - dial indicator.
7. Position the dial indicator with the stem contacting the output shaft (112). Set the dial indicator to zero.
8. Insert the J 28585 - snap ring remover through the vehicle speed sensor bore and lift the speed sensor rotor for measurement. Protect the bore with a piece of wood or a suitable piece of plastic.
9. Proper end play clearance is 0.15-0.65 mm (0.006-0.255 in).
10. Record measured specification and, if necessary, adjust the clearance with the proper thickness selective thrust washer on reassembly. Refer to step 3.
11. Remove the dial indicator set and the post.





Caution: Refer to Fastener Caution (Fastener Caution).

12. Install the stud (127).

* Tighten the bolt (128) and the stud (127) to 50-55 Nm (37-40 lb ft).
* Tighten the bolt (129) to 20-27 Nm (15-20 lb ft).