Power Transfer Unit Case Extension Housing Cleaning and Inspection

Courtesy of GENERAL MOTORS COMPANY

Callout	Component Name
Preliminary Procedure Clean the power transfer unit extension housing in cleaning solvent and air dry. The case halves, internal gears and bearings are not serviceable components. If damage is present, the transfer case assembly must be replaced.
1	Power Transfer Unit Case Extension Housing NOTE: Inspect for excessive wear, cracks, or damage. The power transfer unit case assembly must be replaced if damage is present.
2	Power Transfer Unit Case Extension Housing Sealing Surfaces NOTE: Repair small scratches or nicks with a soft stone.
3	Idler Gear Shaft Tube O-ring Sealing Surface
4	Power Transfer Unit Case Fill Plug Hole NOTE: Inspect for thread damage or sealing surface.