GM Service Manual Online
For 1990-2009 cars only

Tools Required

J 37668-A Output Shaft Seal Installer ( 4401 and4470 Transfer Case)

Removal Procedure


    Object Number: 715670  Size: SH
  1. Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  2. Remove the transfer case shield from the vehicle. Refer to Transfer Case Shield Replacement .
  3. Remove the rear propeller shaft from the transfer case.
  4. • For vehicles equipped with the one piece rear propeller shaft, refer to One-Piece Propeller Shaft Replacement in Propeller Shaft.
    • For vehicles equipped with the two piece rear propeller shaft, refer to Two-Piece Propeller Shaft Replacement in Propeller Shaft.
  5. Remove the transfer case rear output shaft seal.

Installation Procedure


    Object Number: 687288  Size: SH
  1. Install the transfer case rear output shaft seal in the transfer case with your fingers.
  2. Using the J 37668-A , install the transfer case rear output shaft seal.
  3. Install the rear propeller shaft in to the transfer case.
  4. • For vehicles equipped with the one piece propeller shaft, refer to One-Piece Propeller Shaft Replacement in Propeller Shaft.
    • For vehicles equipped with the two piece propeller shaft, refer to Two-Piece Propeller Shaft Replacement in Propeller Shaft.
    • Check the transfer case fluid level. Refer to Transfer Case Fluid Replacement .
  5. Install the transfer case shield to the vehicle. Refer to Transfer Case Shield Replacement .
  6. Lower the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.