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Jeff,

My Diff Lock does not have an audible warning.

Thanks Hank, I will try to remember to check mine. 
So the possibility of someone turning on the diff lock and driving around could be in the realm of possibility. I am sure that would be hard on the diff when your on pavement. I should have probably checked to see if my diff lock works while I had it up in the air, but did not really think about it.