WARNING: This page is about a different car, the 2009 GMC Sierra and 2009 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Replacing Transmission Fluid Pump Seal
Courtesy of GENERAL MOTORS CORP.
Callout
Component Name
1
A/Trans Torque Dampener Fluid Seal Retaining Ring
2
A/Trans Fluid Pump Seal Special Tool: J 45000
Seal Remover