Question about 2002 Chevrolet Silverado 2500HD

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The 4 wheel wont engage but divers good in 2 wheel

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Most of the time its the actuator on the front axel. GM has had a problem with these units. If you put the 4-wd shifter in low range is the transfer case shifting into low? You will notice this because it will feel very torquie but the vehicle speed will be drasticly reduced. If it goes into low range then replace the actuator on the front axel.

Posted on Mar 25, 2011

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If I read this correctly ( which I might not have, bit early for me ), the front drive shaft will engage ( from the transfer case ) but the front wheels are not engaged ?

If so, sounds like either the vacuum from the IWE ( Integrated Wheel End ) is not being released, or the IWEs have had an issue with part vacuum ( damage vacuum lines ) and the IWE gear is rounded off.

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sscullys_108.jpg

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with trnsmission in neutral or park start engine measure vacuum on the two vac lines at front axle shift motor . one line should have approx 20" vacuum. other line should have none
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