WARNING: This page is about a different car, the 2008 Pontiac G5 and 2008 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Locating Drive Sprocket Support
Courtesy of GENERAL MOTORS CORP.
Remove the six bolts (53) form the drive sprocket support (43).
Remove the drive sprocket support (43) from the case (51).