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: View Of Main Shaft
Courtesy of GENERAL MOTORS CORP.
Callout
Component Name
1
Main Shaft Assembly
2
Internal Gear Thrust Bearing Assembly - 2nd Position