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Q: 2004 chevy z71 my truck wants to run in auto 4wheelndrive all the time! on 2004 Chevrolet Silverado 1500

I try to put it in 2 hi but it will iick outbof gear and does the same thing in 4 low.my dash said service transfercase once but no codes.Is it supposed to run in the 4 wheel automatic mode? If not what would be the problem?
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4x4 system can be scan tested with a full function scanner! Have a mechanic check it for codes and actual functions with such scanner. Too many possibilities to gess at it.
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