Question about Chevrolet 1500
Look for broken or missing vacuum lines. Typically a vac line would have pulled off of the intake manifold. If you find a vacuum line that goes down to the transfer case, follow it- again, looking for breaks or being pulled off somewhere along the way or on the transfer case.
Some 4x4's use a step-motor (very precisely calibrated motor that moves in specific steps- also called an encoder). These do fail from time to time.
Posted on Oct 02, 2009
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Posted on Jan 02, 2017
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