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 MANUALSCHEVROLET2012CHEVY EXPRESS G2500, VAN PASSENGER, 4.8L ENG VIN AREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1613 (AUTOMATIC TRANSMISSION - ALLISON - REPAIR INSTRUCTIONS - ON VEHICLE)
2012 Chevrolet Chevy Express G2500, Van Passenger, 4.8L Eng VIN A
Section 1613 (Automatic Transmission - ALLISON - Repair Instructions - On Vehicle)
2012 Chevrolet Chevy Express G2500, Van Passenger, 4.8L Eng VIN ASECTION Section 1613 (Automatic Transmission - ALLISON - Repair Instructions - On Vehicle)
WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- Repair Instructions - On Vehicle
- Transmission Control Module Replacement
- Control Valve Solenoid Replacement (SS1, SS2, SS3, TCC, and MAIN MOD)
- Control Valve Solenoid Replacement (PCS1 and PCS2)
- Differential Drive Pinion Gear Yoke Replacement
- Torque Converter Replacement
- Pressure Switch Manifold Replacement
- Power Take-Off Cover Gasket Replacement
- Range Selector Lever Cable Adjustment
- Manual Shift Shaft, Detent Lever, and Position Switch Assembly Replacement
- Torque Converter Housing Bolt Seal Replacement
- Transmission Fluid Filter Adapter Replacement
- Range Selector Lever Cable Replacement
- Transmission Fluid Cooler Hose/Pipe Quick-Connect Fitting Disconnection and Connection
- Transmission Fluid Cooler Hose/Pipe Connector Replacement
- Transmission Internal Mode Switch Replacement
- Automatic Transmission Fluid and Filter Replacement
- Oil Pan Replacement
- Speed Sensor Replacement
- Transmission Fluid Cooler Hose/Pipe Replacement
- Transmission Fluid Auxiliary Cooler Replacement (LMM Diesel)
- Transmission Fluid Auxiliary Cooler Replacement (Gas)
- Transmission Heat Shield Replacement
- Control Valve Body Replacement
- Torque Converter Fluid Seal Replacement
- Rear Propeller Shaft Seal Replacement
- Manual Shift Shaft Seal Replacement
- Wiring Harness Replacement
- Automatic Transmission Fluid Pressure Test Hole Plug Replacement
- Transmission Mount Replacement
- Transmission Replacement
RENDER: 1.0x
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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.