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.
Most common problem is in the coil that goes in the front end,and the switch.check for blown fuses.
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