Removal Procedure

Raise the vehicle. Refer to LIFTING AND JACKING THE VEHICLE in General Information.
Place a drain pan under the vehicle.
Remove the propeller shaft. Refer to PROPELLER SHAFT REPLACEMENT - REAR in Propeller Shaft.
Remove the case extension housing rear oil seal.
Use a flat bladed tool and carefully pry the seal from the housing.

Fig 1: Transmission 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 .