Power Transfer Unit Input Shaft Cleaning and Inspection

WARNING: This page is about a different car, the 2018 Buick Envision. However, it is still accessible from the selected car via links, so may be relevant.

Courtesy of GENERAL MOTORS COMPANY

Callout	Component Name
Preliminary Procedure Clean the power transfer unit input shaft in cleaning solvent and air dry. The case halves, internal gears and bearings are not serviceable components. If damage is present, the power transfer unit must be replaced as an assembly.
1	Power Transfer Unit Input Shaft Splines NOTE: Inspect for excessive wear, cracks, or damage.
2	Power Transfer Unit Input Shaft - Front Seal Surface NOTE: Inspect for pitting, excessive wear, or damage.
3	Power Transfer Unit Input Shaft Gear Teeth NOTE: Inspect for excessive wear or damage.
4	Power Transfer Unit Input Shaft - Intermediate Drive Shaft Seal Surface NOTE: Inspect for pitting, excessive wear, or damage.
5	Power Transfer Unit Input Shaft Bearing - Rear NOTE: Inspect for excessive wear or damage.
6	Power Transfer Unit Input Shaft Bearing - Front NOTE: Inspect for excessive wear or damage.