High/Low Planetary Carrier Cleaning and Inspection
WARNING: This page is about a different car, the 2023 GMC Sierra 3500 HD and 2023 GMC Sierra 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
- 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.
- Inspect the transfer case high/low clutch engagement teeth (1) for chips or excessive wear.
- Inspect the transfer case planetary carrier sun gear thrust washer surface (2) for scoring or excessive wear.
- Inspect for a transfer case high/low planetary carrier pinion gear thrust washer (3) being on each side of the planetary gears.
- Inspect the transfer case high/low planetary pinion gear (4) for broken, damaged, or debris embedded in the root of the teeth.