1999-2013 Silverado: 4X4 Repair 

If you're having 4x4 engagement/disengagement issues, a "Service 4 Wheel Drive" message, or getting diagnostic trouble codes C0378 or C0379, there's a good chance the front axle 4X4 actuator is to blame. The repair process is the same across several GM 4WD products, including: Sierra, Silverado, Escalade, Suburban, Yukon, Tahoe, Avalanche, Colorado, and Denali. The actuators differ slightly in part number, but the method is the same across many years (1999-2014).
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CHAPTERS
0:00 Symptoms
0:11 Actuator Removal
0:33 Thread Tape
0:50 Installation
1:02 Ops Check