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Q: 4 wheel drive wont work when engaged on 1994 Toyota 4Runner

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4x4 ingages in transfer case but not in front axles
(1) Answer
The engaging of the front differential is controlled by an actuator on the front differential, it is vacuum operated,and controlled by solenoids which send a vacuum signal to the actuator to move it and lock the differential so that the front wheels will turn, I would suspect that the vacuum lines may not be connected or an electric solenoid has failed, need to have a tech troubleshoot this..
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