High/Low Planetary Carrier Cleaning and Inspection

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2011 GMC Yukon XL, 2011 GMC Yukon, 2011 Chevrolet Tahoe, 2011 Chevrolet Suburban, and 2011 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: High/Low Planetary Carrier

Courtesy of GENERAL MOTORS CORP.

Callout	Component Name
Preliminary Procedure Inspect all components or sub-components and perform any repair procedure necessary to fix the damage. If the damage cannot be repaired, replace the component or sub-component as indicated. Clean all components in cleaning solvent and air dry. Do not spin the planetary gears with compressed air. The high/low planetary carrier is only serviced as an assembly.
1	Transfer Case High/Low Clutch Engagement Teeth TIP: Inspect the engagement teeth for chips or excessive wear.
2	Transfer Case Planetary Carrier Sun Gear Thrust Washer Surface TIP: Inspect the thrust washer surface for scoring or excessive wear.
3	Transfer Case High/Low Planetary Carrier Pinion Gear Thrust Washer TIP: Inspect for a thrust washer being on each side of the planetary gears.
4	Transfer Case High/Low Planetary Pinion Gear TIP: Inspect for broken, damaged, or debris embedded in the root of the teeth.