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There is a part called an actuater. It looks like a plunger. They are natorious for dry rotting and the four wheel drive being engaged is on a vaccuum system that involves the actuater. Once that gets a hole in it, it stops the vaccuum and will not engage. It costs about 65 dollars and is about a 15 minute job to fix. It is located under your car battery. Remove your battery and the battery plate that your battery sits on and you will then be able to see the actuater. Once you see it, it is self explanitory on how to remove. Call your local gmc dealer to obtain part.

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Q: What would cause the push button 4x4 not engage on a 1994 GMC jimmy?
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