2002 GMC Yukon
2002 GMC Yukon
2004 TRANSMISSION Transfer Case - NVG 149-NP (One Speed Automatic) - SUV
2004 TRANSMISSION Transfer Case - NVG 149-NP (One Speed Automatic) - SUV
TRANSFER CASE NO FRONT DRIVE
Transfer Case No Front Drive
Cause
Correction
DEFINITION: The transfer case is not delivering engine torque to the front propeller shaft.
Review the Symptoms - Transfer Case and perform the necessary inspections.
Viscous coupling faulty 1. Inspect the transfer case fluid for being black. If the fluid is
black, it is most likely caused by a viscous coupling failure.
2. Test for a faulty viscous coupling. Refer to Transfer Case
Description and Operation.
3. Disassemble the transfer case. Refer to Transfer Case
Disassemble in Transfer Case - NVG 149-NP3 Unit Repair.
4. Inspect the viscous coupling for a bulged cover. Refer to
Cleaning and Inspection in Transfer Case - NVG 149-NP3 Unit
Repair.
5. Replace the viscous coupling if it is faulty. Refer to Transfer
Case Assemble in Transfer Case - NVG 149-NP3 Unit Repair.
Planetary carrier faulty 1. Disassemble the transfer case. Refer to Transfer Case
Disassemble in Transfer Case - NVG 149-NP3 Unit Repair.
2. Inspect for faulty planetary carrier components. Refer to
Cleaning and Inspection in Transfer Case - NVG 149-NP3 Unit
Repair.
3. Replace any faulty planetary carrier components. Refer to
Transfer Case Assemble in Transfer Case - NVG 149-NP3 Unit
Repair.
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