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The front axle is engaged by vacuum. Most common is a cracked or leaking hose but can also be holes rusted in the vacuum canister. This canister is mounted on the front axle, passenger side. Sometimes they just get gunked up and need cleaned and lubricated to get them working again. When it is working properly the vacuum pulls a fork inside the axle. That fork slides a gear that connects the wheel to the differential axle. So without vacuum the 4x4 cant engage. In most cases it comes down to issues near this canister. Check it and see.

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Q: Why won't accuator lock front differential on 98 dodge 2500 Is there a fuse to check?
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