Hi,
Is this an AWD model? If it has a transfer case, it must be. As far as the noise, approximately the center under the vehicle is where it would be located. Have you checked the fluid condition and level or tried to service the unit first?
If you look at the attachments below, they include the directions and pics specific to this vehicle for servicing the transfer case. If you simply want to check the fluid, only remove the fill plug (top one/see pic below). Fluid should be at the bottom of the threaded portion where the fill plug goes.
Also, if you add fluid, you have to use the correct fluid type for this vehicle. Here are the manufacturer's specifications for the fluid:
2004 Pontiac Truck Aztek AWD V6-3.4L VIN E
Fluid Types
Vehicle Maintenance Fluids Fluid - Transfer Case Specifications Fluid Types
FLUID TYPES
Transfer Case .................... Synthetic VersaTrak Fluid GM P/N 12378514
Start by making sure it is full and the fluid is clean. If it has never been serviced, try that first. Also, if it is loud enough for you to record, do that and upload it for me to hear.
Let me know if this helps or if you have other questions.
Take care,
Joe
See pics below.
Images (Click to enlarge)
Mar 26, 2021 at 8:36 PM
