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The actuator is a vacuum driven relay that locks the front hubs when the 4 wheel drive is engaged. Failure of this part would result in the transfer case being engaged and sending power through the front shaft but the front tires would not have torque. This is a failure prone form of auto locking hubs. Used on late model Chevys Dodges and Some Cherokees. Alternatives would be a constantly locked hub set up, which consequently reduces fuel millage. Or, a manual lock system such as that used on Fords for decades.

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โˆ™ 2007-08-02 00:11:44
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Q: What is the front differential vacuum actuator lines layout for a 1984 Chevrolet S series?
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