Removal Procedure

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Raise the vehicle.
Place a drain pan under the vehicle.
Remove the propeller shaft. Refer to PROPELLER SHAFT REPLACEMENT - ONE PIECE or PROPELLER SHAFT REPLACEMENT - TWO PIECE .
Using the J 6125-1B (1) and the J 23129 (2), remove the output shaft seal (3) from the extension housing (4).

Fig 1: Removing Output Shaft Seal Using J 6125-1B & J 23129
Courtesy of GENERAL MOTORS CORP.
Inspect the case extension housing for damage. Replace the extension housing if necessary. Refer to Transmission Extension Housing Assembly Replacement .