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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 54 (Transfer Case - NVG 261-NP2 - Overhaul) >> Repair Instructions >> Cleaning and Inspection >> Drive Chain and Sprockets >> Notes

Drive Chain and Sprockets: Notes

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  1. Clean the drive chain (1), drive sprocket (3), and driven sprocket (2) in cleaning solvent and air dry.
  2. Inspect the drive chain (1) for the following conditions:
    • Loose link pins
    • Binding or stiff links
    • Debris embedded in the links
    • Worn teeth surfaces
    Fig 1: Inspecting Drive Chain and Sprockets
    GM801261Courtesy of GENERAL MOTORS CORP.
  3. Replace the chain if any of the above conditions are found.
  4. Inspect the driven sprocket (2) and the drive sprocket (3) for the following conditions:
    • Chipped teeth
    • Excessive worn gear surfaces, slight wear marks are normal
    • Debris embedded in the root of the teeth
  5. Replace the sprocket if any of the above conditions are found. The chain and sprockets may be replaced separately.
  1. Inspect the 2/4 wheel drive synchronizer gear for chipped or worn engagement teeth.
    Fig 2: Identifying 2/4 Wheel Drive Synchronizer Gear
    GM1492330Courtesy of GENERAL MOTORS CORP.
  2. Inspect the 2/4 wheel drive synchronizer gear journal surface for the following conditions:
    • Gouging
    • Roughness
    • Excessive wear
  3. Replace the 2/4 wheel drive synchronizer gear if faulty.