High/Low Planetary Carrier Assembly
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2012 GMC Yukon XL, 2012 GMC Yukon, 2012 Chevrolet Tahoe, 2012 Chevrolet Suburban, and 2012 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
The first design light duty 3-pinion (1) and heavy duty 5-pinion (2) high/low planetary carriers can be identified as having a 30 tooth design with an inside diameter (a or b) of 61.3 mm (2.41 in).
The second design light duty 3-pinion (4) and heavy duty 6-pinion (3) high/low planetary carriers can be identified as having a 29 tooth design with an inside diameter (c or d) of 60.2 mm (2.37 in).