WARNING: This page is about a different car, the 2008 Buick LaCrosse and 2008 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Identifying Thrust Bearing & 1-2 Support Drum
Courtesy of GENERAL MOTORS CORP.
Use a small screwdriver in order to gently pry the thrust bearing (685) off of the 1-2 support drum (687).
Lift the 1-2 clutch roller assembly (683) out of the 1-2 support drum.