More than likely the auto locking hubs a not disengaged all the way, most of the ones I have heard make more of a clicking noise, I believe they are vacuum operated and the seal in them leaks vacuum resulting in being half engaged resulting in the rattle/cliking noise, or in some cases it may be vacuum supply, like a leaking or broken vacuum hose going to the hub, but in most cases the hub itself is bad, hope this helps.
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Wednesday, September 11th, 2013 AT 10:45 AM