GM 4x4 Front Axle Actuator Diagnostic Tip | Tech Tip 

Today, we have a quick tech tip regarding the front axle actuator on a GM pickup truck from the mid 2000s. We present a short case study on a 2003 GMC Sierra 5500 with a four button 4 wheel drive system.
Part Number: TCA21, TCA20
Part Description: Four Wheel Drive Actuator
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