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number13va

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  1. number13va
    Hello I have a 15 Gmc Sierra 1500.. I am getting a service 4wd message at start up and randomly while driving. Just before I get this message while driving I can hear what sounds like the front diff trying to lock in. Slight roaring noise for about 4 seconds from the front end then goes away. I suspect the actuator motor is bad on the diff. Does any one have any info on this.. Thanks
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