Special Tools

For equivalent regional tools, refer to Special Tools.

Caution: Refer to Fastener Caution in the Preface section.




1. If removed, install the transfer case mounting studs and tighten the mounting studs to 10 N·m (89 lb in).



2. Attach the J 45759 assembly fixture  (2) to the front case half using the adapter studs. All of the assembly procedures can be performed with the case mounted to the J 45759 assembly fixture  (2).
3. Install the J 45759 assembly fixture  (2) into the J 3289-20 holding fixture  (1) and secure with pivot pin.



4. If removed, apply pipe sealant GM P/N 12346004 (Canadian P/N 10953480) to the threads on the vent.
5. Install the vent and tighten to 6 N·m (53 lb in).



6. Install the front output shaft rear bearing in the rear case half.

•	Use a hammer and a brass drift only on the outer bearing race.

•	Ensure the bearing is kept square to the bore while installing.





Note: Lubricate all bearings and bearing journals with transfer case fluid during installation.

7. Install the input shaft bushing in the front case half using the J 36373 bearing installer and a hammer.



8. Install the front bearing for the front output shaft in the front case half.

•	Use a hammer and a brass drift only on the outer bearing race.

•	Ensure the bearing is kept square to the bore while installing.




9. If removed, install the input shaft rear support bearing in the rear output shaft using J 42176 driver handle  (1) and J 45848 bearing installer  (2).



10. Using the J 22828 race installer and a hydraulic press, install the rear output shaft bearing with the retaining ring groove towards the gear.



11. Using the J 22828 race installer and a hydraulic press, install a NEW speed reluctor wheel.



12. Install a NEW retaining ring for the rear output shaft bearing.



13. Install the rear output shaft in the annulus gear.




Warning: The vehicle could roll while in park if the annulus gear becomes disengaged from the rear output shaft. Always install a new rear output shaft to annulus gear retaining ring. Ensure the rear output shaft retaining ring is fully seated in the annulus gear.

Caution: Damage may occur to the viscous coupling if the retaining ring for the rear output shaft to the annulus gear fails or becomes dislodged during vehicle operation. Always install a new rear output shaft to annulus gear retaining ring. Ensure the rear output shaft retaining ring is fully seated in the annulus gear.

14. Install a NEW annulus gear retaining ring.



15. Install the rear output shaft in the rear case.

•	Spread the rear output shaft rear bearing outer retaining ring (1).

•	Using a soft-face hammer, tap on the rear output shaft.

16. Ensure the retaining ring (1) is installed in the groove of the rear output shaft bearing (2).



17. Install the input shaft in the front case.



18. Install the viscous coupling on the sun gear.



19. Install the drive gear on the sun gear.



20. Using a hammer with the J 45540 ring/bearing installer  (2) and the J 5590 driver  (1), install the bearing on the sun gear. Ensure the bearing is fully seated against the drive gear.



21. Install the sun gear, with the drive gear and the viscous coupling, on the input gear.



22. If it is a new shaft, or if the cup plug was removed, install the cup plug in the front output shaft using a suitable driver. Install the cup plug 1 mm (0.039 in) from flush with the end of the shaft.




Note: Ensure to align the marks of the drive chain and sprockets, if using the chain and sprockets again.

23. Install the drive chain on the drive sprocket.

•	The blue link on the chain faces up.

•	Align the chain, if using it again, with the alignment marks made during disassembly.




24. Install the driven sprocket and the chain.



25. Install the front output shaft in the driven sprocket and the bearing.



26. Lubricate the sun gear thrust washer with J 36850 lubricant or equivalent.
27. Install the sun gear thrust washer.



28. Install the planetary carrier assembly.



29. Lubricate the sun gear thrust washer with J 36850 lubricant or equivalent.
30. Install the planetary carrier thrust washer.




Note: 

•	Ensure that both the sealing surfaces on the front and rear case halves are free of dirt, oil, and cleaning solvent.

•	Ensure the locating pins are installed in the front case half.

31. Install the locating pins in the front case, if necessary.
32. Apply a 3.175 mm (1/8 in) bead of room temperature vulcanizing (RTV) sealant GM P/N 12345739 (Canadian P/N 10953541) or equivalent to the mating surfaces of the front case half.



33. Lower the rear case half into place.



34. Install the case bolts, washers, and brackets.
35. Tighten the case bolts to 21 N·m (15 lb ft).



36. Using the J 45380 bushing remover/installer , install the rear output shaft bushing, if removed or new.



37. Using the J 45756 seal installer , install the rear output shaft seal.



38. Install the vehicle speed sensor (VSS) with a NEW O-ring seal.
39. Tighten the VSS to 17 N·m (13 lb ft).



40. Apply pipe sealant GM P/N 12346004 (Canadian P/N 10953480) to the threads on the drain plug and fill plug.
41. Install the drain plug and tighten to 25 N·m (18 lb ft).
42. Install the fill plug and tighten to 25 N·m (18 lb ft).



43. Using the J 43484 seal installer  (2) and the J 8092 driver  (1), install the front output shaft seal.



44. Using the J 45758 seal installer , install the front input shaft seal.
45. Remove the transfer case from the J 45759 assembly fixture .