Your problem is probably your actuator switch in the front differntial. it is an electronic switch and they sometimes stick or burn out .1A auto parts .com shows how to remove it on u tube . you remove an elector connector and than the switch un screws. sometimes easy but I have had to heat them with a torch to get them out. Go to google type in how to remove actuator switch chevrolet . it should bring up the video. I beleve this will solve your problem if this was helpful please leave good feed back
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