Removal Procedure

WARNING: This page is about a different car, the 2003 GMC Savana and 2003 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.

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 .
Remove the case extension housing rear oil seal. Use a flat bladed tool and carefully pry the seal from the housing.

Fig 1: Removing Case Extension Housing Rear Oil Seal
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 .