Question about 2000 GMC Yukon

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Noise when engaging 4wd

I hear and feel a "clunking" noise in front driver area after pushing any of the 4wd buttons

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I have had this problem and it could be one of three things, first the truck has automatic locking hubs, lack of lubrication to these hubs could cause them to make exessive noise while engaging. also you could need to lubricate your universal joins on your forward drive shaft. lastly my problem was abs wheel sensor actuator in drivers front hub had (internal part of hub looks like a large gear with teeth) had broken a gear off causing the hub to get wear in it making it clunk while engaging the four wheel drive.

Posted on Dec 21, 2008

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