Sun Gears and Lock-Up Hub
WARNING: This page is about a different car, the 2005 GMC Yukon XL and 2005 GMC Yukon. However, it is still accessible from the selected car via links, so may be relevant.
- Clean the front sun gear (1), the rear sun gear (2), and the inner lockup hub (3) in cleaning solvent and air dry.
- Inspect the teeth on the front sun gear (1), the rear sun gear (2), and the inner lockup hub (3) for the following conditions:
- Chipped teeth
- Excessively worn gear surfaces
Slight wear marks are normal.
- Debris embedded in the root of the teeth
- Inspect the thrust washer surfaces for excessive wear or scoring.
- Replace the front sun gear (1), the rear sun gear (2), and the inner lockup hub (3) if they are faulty.