Power Transfer Unit Case Housing Cleaning and Inspection

WARNING: This page is about a different car, the 2017 GMC Acadia. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Power Transfer Unit Case Housing

Courtesy of GENERAL MOTORS COMPANY

Callout	Component Name
Preliminary Procedure Clean the power transfer unit case housing in solvent, air dry. Remove all residual input shaft seal material from the input shaft seal bore. 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 Housing - Model Dependent NOTE: Inspect for damage to case.
2	Power Transfer Unit Case Housing Sealing Surface NOTE: Inspect the input shaft seal ID bore for scoring or damage. Inspect the face seal/O-ring seal OD sealing surface for scoring or damage.
3	Power Transfer Unit Case Vent Connector Hole
4	Power Transfer Unit Case Housing Threaded Bolt Holes NOTE: Repair any damaged threads.
5	Power Transfer Unit Case Housing Sealing Surface NOTE: Inspect for scoring or damage.
6	Power Transfer Unit Case Housing Bearing Races NOTE: Inspect for brinnelling or excessive wear.
7	Power Transfer Unit Case Housing Sealing Surface NOTE: Inspect for scoring or damage.
8	Power Transfer Unit Case Housing Threaded Bolt Holes NOTE: Inspect for thread damage
9	Power Transfer Unit Case Housing Threaded Bolt Holes
10	Power Transfer Unit Drain Plug Hole NOTE: Inspect for thread damage