WARNING: This page is about a different car, the 2004 Suzuki Swift + and 2004 Chevrolet Aveo. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Planetary Ring Gear & Flange
Courtesy of GENERAL MOTORS CORP.
Install a new planetary ring gear flange to the planetary ring gear.
Fig 2: Removing Snap Ring Planetary Ring Gear Using A Screwdriver