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

4x4 ingages in transfer case but not in front axles
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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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