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.
2012 Chevrolet Express 1500 AWD V8-5.3LFACTORY OEM SERVICE PROCEDURE
Transfer Case
Transfer Case Disassembled View
Case Components
1 - Adapter Stud
2 - Front Case Half
3 - Locating Pin
4 - Rear Output Shaft Bearing Outer Retaining Ring
5 - Rear Case Half
6 - Wiring Harness Bracket
7 - Vehicle Speed Sensor (VSS)
8 - VSS O-Ring
9 - Rear Output Shaft Bushing
10 - Rear Output Shaft Seal
11 - Oil Fill Plug
12 - Case Half Bolt
13 - Oil Drain Plug
14 - Locating Pin
15 - Front Output Shaft Seal
16 - Vent
17 - Input Shaft Seal
Internal Components
1 - Planetary Carrier Front Thrust Washer
2 - Planetary Pinion Gear Thrust Washer
3 - Planetary Pinion Gear
4 - Planetary Pinion Gear Thrust Washer
5 - Planetary Pinion Gear Shaft
6 - Planetary Carrier Rear Thrust Washer
7 - Input Shaft Rear Support Bearing
8 - Rear Output Shaft
9 - Annulus Gear
10 - Annulus Gear Retaining Ring
11 - Rear Output Shaft Bearing
12 - Rear Output Shaft Bearing Retaining Ring
13 - Speed Reluctor Wheel
14 - Rear Output Shaft Shipping Seal
15 - Sun Gear Bushing
16 - Sun Gear
17 - Viscous Coupling
18 - Drive Sprocket
19 - Driven Sprocket
20 - Front Output Shaft
21 - Front Output Shaft Cup Plug
22 - Front Output Shaft Rear Bearing
23 - Drive Chain
24 - Front Output Shaft Front Bearing
25 - Sun Gear Bearing
26 - Oil Restrictor
27 - Input Shaft
28 - Input Shaft Bushing
29 - Oil Scoop
Factory Service Tools
Use the Manual With the Right Hardware
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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.