Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2006CHEVY EXPRESS G2500, VAN CARGO EXTENDED, 5.3 T, 4L60E/M30REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1184 (TRANSFER CASE - MP 1222/1225/1226-NQG)
2006 Chevrolet Chevy Express G2500, Van Cargo Extended, 5.3 T, 4L60E/M30
Section 1184 (Transfer Case - Mp 1222/1225/1226-NQG)
2006 Chevrolet Chevy Express G2500, Van Cargo Extended, 5.3 T, 4L60E/M30SECTION Section 1184 (Transfer Case - Mp 1222/1225/1226-NQG)
WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- Specifications
- Schematic & Routing Diagrams
- Component Locator
- Diagnostic Information and Procedures
- Diagnostic Starting Point - Transfer Case
- Symptoms - Transfer Case
- Four-Wheel Drive Does Not Disengage
- Four-Wheel Drive Does Not Engage
- Four-Wheel Drive Indicator Always On
- Four-Wheel Drive Indicator Inoperative
- Transfer Case Popping Noise
- Transfer Case Whine or Rumble Noise
- Transfer Case Growl or Grinding Noise
- Transfer Case Clunk In 2HI Only
- Transfer Case Clunk In 4HI
- Transfer Case Clunk In 4LO
- Transfer Case Will Not Shift
- Transfer Case Jumps Out of Gear
- Transfer Case Leak Diagnosis
- Repair Instructions - On Vehicle
- Transfer Case Control Lever Replacement
- Transfer Case Control Rod Replacement
- Transfer Case Shield Replacement
- Transfer Case Fluid Replacement
- Front Output Shaft Seal Replacement
- Rear Output Shaft Seal Replacement
- Transfer Case Rear Extension Bushing Replacement
- Vehicle Speed Sensor Replacement
- Transfer Case Assembly Replacement
- Transfer Case Adapter Replacement
- Input Shaft Seal Replacement
- Repair Instructions - Off Vehicle
- Transfer Case Disassemble
- Transfer Case Holding Fixture Installation
- Access Hole Plugs, Fill & Drain Plug, Lever, Vent, Shift Control Switch, & Vehicle Speed Sensor Removal
- Rear Output Shaft Seal and Bushing Removal
- Transfer Case Rear Case Half Removal
- Oil Pump Suction Pipe and Shift Forks Removal
- Drive Chain and Rear Output Shaft Assembly Removal
- Shift Detent Plunger Assembly, Shift Detent Lever, Input Shaft, and Planetary Assembly Removal
- Front Output Shaft Assembly Removal
- Transfer Case Front Half Cleaning and Inspection
- Transfer Case Rear Half Cleaning and Inspection
- Oil Pump Cleaning and Inspection
- Rear Output Shaft Cleaning & Inspection
- Front Output Shaft & Input Shaft Cleaning & Inspection
- Drive Chain, Drive Sprocket, & Driven Sprocket Cleaning & Inspection
- High/Low Planetary Carrier Cleaning & Inspection
- High/Low Shift Components Cleaning & Inspection
- Two/Four Wheel Drive Shift Components Cleaning & Inspection
- Rear Output Shaft Bushing Replacement
- Shift Detent Lever Bearing Replacement
- Input Shaft Pilot Bearing Replacement (Light Duty)
- Input Shaft Pilot Bearing Replacement (Heavy Duty and Super Heavy Duty)
- Front Output Shaft Front Bearing Replacement
- Front Output Shaft Rear Bearing Replacement
- Front Output Shaft Drive Sprocket Bearing Replacement
- Transfer Case Assemble
- Shift Detent Plunger Assembly, Shift Detent Lever, Input Shaft, and Planetary Assembly Installation
- Rear Output Shaft Assembly Installation
- Shift Forks Installation
- Front Output Shaft Assembly, Drive Chain, and Oil Pump Suction Pipe Installation
- Transfer Case Rear Case Half Installation
- Rear Output Shaft Seal and Bushing Installation
- Access Hole Plugs, Fill and Drain Plug, Lever, Vent, Shift Control Switch, and Vehicle Speed Sensor Installation
- Input Shaft Seal and Front Output Shaft Seal Installation
- Transfer Case Disassemble
- Description & Operation
- Special Tools and Equipment
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.