Transfer Case Growl or Grinding Noise

WARNING: This page is about a different car, the 2007 Hummer H2. However, it is still accessible from the selected car via links, so may be relevant.

Cause	Correction
DEFINITION: A faulty internal transfer case component that causes a growl or grinding noise in the transfer case while the vehicle is turning. Review the Symptoms - Transfer Case and perform the necessary inspections.
High/low planetary carrier assembly	Inspect the high/low planetary carrier pinion gears for the following conditions: Chipped, bent or deformed teeth Pinion gear needle bearing worn Pinion gear thrust washers missing Seized or binding pinion gears Refer to Cleaning and Inspection . Inspect the high/low planetary carrier input gear for excessive thrust end play. Inspect the input gear teeth for excessive wear or damage. Replace the high/low planetary carrier assembly if any of the above conditions exist. Refer to Transfer Case Disassemble and Transfer Case Assemble .
Annulus gear	Inspect the annulus gear for teeth damage or wear. Refer to Cleaning and Inspection . Replace the annulus gear if it is faulty. Refer to Transfer Case Disassemble and Transfer Case Assemble .
Planetary differential	Inspect the planetary differential pinion gears for the following conditions: Chipped, bent or deformed teeth Pinion gear bushings worn Pinion gear thrust washers missing Seized or binding pinion gears Refer to Cleaning and Inspection . Inspect the planetary differential for deformation. Refer to Cleaning and Inspection . Replace the planetary differential assembly if it is faulty. Refer to Transfer Case Disassemble and Transfer Case Assemble .
Sun gears	Inspect the sun gears for the following conditions: Gear tooth failure Worn or galled thrust surfaces Refer to Cleaning and Inspection . Replace the sun gears if they are faulty. Refer to Transfer Case Disassemble and Transfer Case Assemble .
Thrust washers	Inspect the thrust washers for seizure to the planetary differential. Inspect the thrust washers for galling. Replace the thrust washers if they are faulty and the mating component if it is damaged. Refer to Transfer Case Disassemble and Transfer Case Assemble .
Planetary differential not timed properly	Inspect the planetary differential for being timed properly. Refer to Transfer Case Assemble . Properly time the planetary differential gears. Refer to Transfer Case Assemble .