those tranfer cases work on the electric motor and vac lines. so check the vac lines and while your under the truck have someone put it in 4hi and listen for the motor, if it doesn't engage it could be the motor, a wire, or worse the 4wd control unit, which might be intergrated into the BCM
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Formerly known as blk95formula
86t/a_ram_air on TGO
2018 Silverado 1500
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