Removal Procedure

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

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

Fig 1: Removing Transmission 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 .