70. Case Extension Install/Final Drive End Play Check

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





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. Install the case extension bolts (128, 129).
5. Hand tighten bolts (128, 129) until case extension (134) is seated onto case.






6. Install the long J 25025-7A and the J 8001.
7. Position the dial indicator with the stem contacting the output shaft (112). Set the dial indicator to zero.
8. Insert the J 28585 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.
10. Record measured specification and, if necessary, adjust the clearance with the proper thickness selective thrust washer on reassembly.
11. Remove the dial indicator set and the post.





12. Install the stud (127).
Apply GM sealing adhesive 12346004 before reuse.

Tighten
- 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).