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Home > GMC > K2500 Truck > 4WD Parts > 1996-1999 GMC K2500 Truck 4WD Front Axle Shift Actuator with 2 Terminal Connection

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1996 - 1999 GMC K2500 Truck 4WD Front Axle Shift Actuator with 2 Terminal Connection


In Stock (Ships same day for orders placed by 3 PM ET)

List Price:$170.00

Our Price: $60.45
 (You Save $109.55)

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Part Number: 1AFWA00001

How To Install Repalce Front 4x4 Axle Actuator 1995-99 Chevy Tahoe GMC Yukon

This original style GM 4x4 truck front axle shift actuator is designed to REPLACE your original, defective shift actuator. This is a 1st design actuator. If your truck's current actuator has a black plastic case see part# 1AFWA00004.


  • 2 wire plug with round terminals
  • Mounts INTO front axle housing
  • Replaces dealer part number: 26013495
  • Durable construction shift actuator
  • Direct bolt in replacement
  • Built to strict quality control standards
  • Improved gas filled heating element type activation


The 4 wheel Drive Actuator actually installs quite easily. Locate it on the front axle. Unplug it. Use a large adjustable or correct size wrench and remove the actuator. Reverse to install a new one.

How this four wheel drive actuator works

When you press the button in your vehicle an electrical current passes through the actuator. The actuator is filled with a gas. This gas expands when heated. The electrical current heats the gas the gas builds pressure and forces the plunger out which engages the front axle.

The Problem

There are a number of things that can go wrong to cause you not to be able to engage four wheel drive. Age, damage, and lack of consistent use are the most common reasons for these actuators to go bad. These actuators work in an unfriendly environment. Underneath the car attached to the drivetrain, they are subject to extreme temperature change as well as physical damage from dirt, debris, rocks, etc. The gas inside the actuator can leak out over time and/or from a fracture caused by road debris. There is a mechanical mechanism that can start to stick as time goes on. Sometimes these actuator just plain don't work in extreme cold weather as the gas actually does not get hot enough to expand. Many times these actuators are not used for 9-10 months or more during warm weather. A little moisture penetrating can quickly cause a malfunction. Any one, or combination of these can result in your 4WD system not engaging or not staying engaged.


A VERY telling symptom that this particular part is your problem is if your 4WD engages when the weather is warm but either does not engage or takes a lot longer to engage when the weather is colder. On most vehicles you push a button for 4WD and an indicator light blinks until the actuator engages. While the light is blinking the electric current is heating the gasses. If you light continues to blink but does not engage or takes a long time to engage (more than 10 seconds) then this actuator is the problem.
Our manufacturer changed the mixture of gas in this new actuator so it is more sensitive at lower temperatures. This has solved the cold temperature problem. We suggest engaging your four wheel drive periodically even during good weather just to "work out" the part and make sure it does not stick.

1 Year Warranty

This item is backed by a 1 Year Manufacturers Warranty. In the event this item should fail during intended use, we will exchange the part free of charge (excludes shipping charges) for the original purchaser. Please keep your invoice for proof of this warranty.

This part replaces:
  • OE #: 26013495
  • DORMAN #: 600-100 Branded

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