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Maybe the transfer case shifted out of 4wd but the Axle Disconnect is what controls the 4wd light turning off and on. Check the vacuum lines coming off it into the little switch thing on the firewall.
 

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the blue vacuum line is the one that releases the pressure in the lines to disengage light. on the axle.
 

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I would also check to make sure the axle is not stuck in the connected position. Lift up the axle and see if both tires spin when you try spinning one. If they do then the axle disconnect is failing to disconnect.
 
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