Transfer Case Output Shaft Seal Replacement - Front

Removal Procedure

^ Tools Required
- J 26941 Needle Bearing Puller
- J 23907 Slide Hammer





1. Raise and suitably support the vehicle. Refer to Vehicle Lifting.
2. Place a drain pan or suitable container under the transfer case.
3. Remove the transfer case oil level/filler plug (1) from the transfer case.
4. Remove the transfer case drain plug (2) from the transfer case and drain the transfer case oil.

Important: An index mark (reference mark) should be placed on the front propeller shaft pinion flange yoke and the front differential pinion flange (if equipped) to ensure that the front propeller shaft is installed in the same position from which it was removed. If this precaution is not observed, a driveline imbalance may result causing vibration, premature component wear or other undesirable conditions.

5. Place an index mark on the front propeller shaft pinion flange yoke and the front differential pinion flange.
6. Remove the 4 bolts, the 4 nuts and the front propeller shaft from the vehicle (if equipped)





7. Remove the front output shaft oil seal (1) from the transfer case using J 26941 and J 23907 (if equipped).
8. Remove the front output shaft plug from the transfer case (if equipped).


Installation Procedure

^ Tools Required
- J 37751 Oil Seal Installer
- J 36850 Transjel Transmission Assembly Lubricant





1. Install the new front output shaft oil seal into the transfer case (1) using J 37751 (if equipped).
2. Install the new front output shaft plug into the transfer case using J 37751.
3. Apply J 36850 to the new front output shaft oil seal lip (if equipped).

Notice: Refer to Fastener Notice Service Precautions.

4. Install the front propeller shaft into the vehicle aligning the reference marks made during the removal. Secure the shaft with the 4 bolts and the 4 nuts (if equipped).
^ Tighten the front propeller shaft bolts and nuts to 50 Nm (37 ft. lbs.).
5. Apply GM P/N 12346004, or the equivalent, to the threaded portion of the transfer case drain plug.
6. Install the transfer case drain plug into the transfer case.
^ Tighten the transfer case drain plug to 28 Nm (21 ft. lbs.).
7. Add approximately 1.7 liters (1.8 qts) of 75W-90 GL-4 lubricant, or the equivalent, into the transfer case oil level/filler plug hole. The oil level should be even with the bottom of the oil level/filler plug hole.
8. Apply GM P/N 12346004, or the equivalent, to the threaded portion of the transfer case oil level/filler plug.
9. Install the transfer case oil level/filler plug into the transfer case.
^ Tighten the transfer case oil level/filler plug to 28 Nm (21 ft. lbs.).
10. Lower the vehicle.