Transfer Case - Bw 4479: Removal & Installation Cadillac STS I facelift

Removal Procedure

Note. When performing the following procedure, use only hand tools to remove and install the drain and fill plugs.

1. Raise and suitably support the vehicle. Refer to «Lifting and Jacking the Vehicle»(ref-338130-S15906308302009081700000) .
2. Remove the fill plug (6).
3. Remove the drain plug (8).
4. Allow the transfer case to drain completely.

Installation Procedure

1. Apply sealant GM P/N 12378470, (Canadian P/N 10952622), or equivalent to the threads of the drain plug.
2. Install the drain plug (8) and tighten to 25 N.m (18 lb ft).
3. Fill the transfer case to the bottom of the fill plug hole with DEXRON®-III, GM P/N 12346143, (Canadian P/N 10952622).
4. Install the fill plug (6) and tighten to 25 N.m (18 lb ft).
5. Lower the vehicle.

1. Drain the transfer case fluid, if necessary. Refer to «Transfer Case Fluid Replacement»(ref-338201-S16248138422009081700000) .
2. Remove the exhaust system. Refer to «Exhaust System Replacement»(ref-338131-S05393811512009081700000) .
3. Remove the rear propeller shaft. Refer to «Rear Propeller Shaft Replacement (AWD)»(ref-338144-S22580991792009081700000) or «Rear Propeller Shaft Replacement (RWD)»(ref-338144-S39823555952009081700000) .
4. Support the transmission with a suitable screw jack and a block of wood.
5. Remove the transmission mount-to-body bolts.
6. Using the jack, lower the transmission enough to access the transmission mount-to-transfer case mounting bolts.
7. Remove the transmission mount-to-transmission case mounting bolts.
8. Remove the transmission mount assembly from the vehicle.
9. Remove the front propeller shaft. Refer to «Front Propeller Shaft Replacement»(ref-338144-S02049359252009081700000) .
10. Using another suitable adjustable jack, support the transfer case.
11. Remove the transfer case bolts.
12. Remove the transfer case.

1. Apply grease GM P/N 1051344 (Canadian P/N 993037), or equivalent, on the input splines starting from the front edge to 10 mm inward in a continuous pattern around the inside diameter (ID) of the splines to completely fill the splines.
2. Install the transfer case. CAUTION: Refer to «Fastener Caution»(ref-338111-S07396154872009081700000) .
3. Install the transfer case-to-transmission bolts and tighten to 60 N.m (44 lb ft).
4. Remove the adjustable jack from the transfer case.
5. Install the transmission mount assembly. Refer to «Transmission Mount Replacement (All Wheel Drive)»(ref-338160-S29279432262009081700000) or «Transmission Mount Replacement (Rear Wheel Drive)»(ref-338160-S25992200112009081700000) .
6. Remove the jack and block of wood from under the transmission.
7. Install the front propeller shaft. Refer to «Front Propeller Shaft Replacement»(ref-338144-S02049359252009081700000) .
8. Install the rear propeller shaft. Refer to «Rear Propeller Shaft Replacement (AWD)»(ref-338144-S22580991792009081700000) or «Rear Propeller Shaft Replacement (RWD)»(ref-338144-S39823555952009081700000) .
9. Install the exhaust system. Refer to «Exhaust System Replacement»(ref-338131-S05393811512009081700000) .
10. Refill the transfer case with fluid. Refer to «Transfer Case Fluid Replacement»(ref-338201-S16248138422009081700000) .

Replacement Procedure

1. Remove the transfer case. Refer to «Transfer Case Assembly Replacement»(ref-338201-S16885000752009081700000) .
2. Using the J 45278 (2) and the J-2619-A (1), slide the hook end of the J 45278 beside the seal lip and shaft. See «Special Tools»(ref-338201-S05121672332009081700000) . Turn the hook approximately 60 degrees and pull the seal out with the J-2619-A (1). See «Special Tools»(ref-338201-S05121672332009081700000) .
3. Clean the seal area (1) and input shaft of any old seal material with solvent.
4. Use the J 8092 (1) and the J 46269 (2) to drive in a NEW input seal. See «Special Tools»(ref-338201-S05121672332009081700000) .
5. Install the transfer case. Refer to «Transfer Case Assembly Replacement»(ref-338201-S16885000752009081700000) .

Removal/Installation Procedure

1. Remove the bolts (16) and the dampener (300), some models.
2. Remove the drain plug (8) and the fill plug (6). Ensure all transfer case fluid is drained out of the transfer case.
3. Remove the 17 case attaching bolts (11).
4. Using a screwdriver at the pry points located on the case (1) and cover (2), pry the case (1) and cover (2) apart.
5. Separate the case (1) and cover (2).
6. Remove the alignment dowel (3) from the case, if necessary.
7. Remove the chain snubber.
8. Install 1 plate of the DT-47752 perpendicular to the chain and rotate 180 degrees. See «Special Tools»(ref-338201-S05121672332009081700000) .
9. Install the second plate perpendicular to the chain and secure with the short plate bolts.
10. Install the DT-47752-2 (2) onto the front output shaft (112).
11. Using the long bolts and washers from the DT-47752 , install the J 8433 (1). See «Special Tools»(ref-338201-S05121672332009081700000) . Tighten evenly so the puller remains parallel to the plates.
12. Install the DT-47752-3 into the input shaft.
13. Using an impact wrench, tighten the forcing screw of the DT-47752-2 in order to remove the sprockets, chain, and carrier assembly.
14. Remove the J 8433 (1) and the DT-47752-2 (2). See «Special Tools»(ref-338201-S05121672332009081700000) .
15. Remove the lower sprocket (112), chain (109), and carrier (111) as an assembly.
16. Remove the DT-47752 from the case. See «Special Tools»(ref-338201-S05121672332009081700000) .
17. Remove the snap ring (114).
18. Push the front output shaft (112) from the case (1).
19. Remove the vent baffle bolt (9) and baffle (10) from the case (1).
20. Using a hammer and a suitable driver, remove the front output seal (13) and input seal (14) from the case (1).
21. Using a hammer and a suitable punch, remove the front output bearing (113) and input bearing (117) if they are to be replaced.
22. If required, remove the vent (15) and discard.
23. Install a NEW vent.
24. Remove the thrust washer (100) from the carrier (111).
25. Using a press, remove the input shaft assembly (118, 107, and 110) from the carrier (111).
26. Note the direction of the carrier assembly (111). The groove around the splines face toward the output shaft.
27. Using the J 22888-20A (1) and the J 8107-2 (2), remove the rear sun gear (101) from the rear output shaft. See «Special Tools»(ref-338201-S05121672332009081700000) .
28. Using snap ring pliers, remove the snap ring (102) from the output shaft (106).
29. Push the output shaft (106) from the cover (2).
30. Using a hammer and a suitable punch, from inside the cover, drive out the rear output seal (7) and the outside output bearing (104).
31. Using a hammer and a suitable punch, from outside the cover (2), inside the output shaft bore, drive out the inner output shaft bearing (103).
32. Using the J-2619-A (1) and the J 29369-1 (2), remove the front output cover bearing (116) from the cover. See «Special Tools»(ref-338201-S05121672332009081700000) .