GM Service Manual Online
For 1990-2009 cars only

Cause

Correction

DEFINITION: A faulty internal transfer case component that causes a popping noise in the transfer case.

Review the Symptoms - Transfer Case and perform the necessary inspections.

Chain jump

    • Replace the chain and sprockets. Refer to Transfer Case Disassemble and Transfer Case Assemble in Transfer Case - NVG 261-NP2 Unit Repair.
    • Replace the shaft bearings. Refer to Transfer Case Disassemble and Transfer Case Assemble in Transfer Case - NVG 261-NP2 Unit Repair.
    • Inspect for damaged components caused by metal debris. Refer to Transfer Case Cleaning and Inspection in Transfer Case - NVG 261-NP2 Unit Repair.