1999 GMC Suburban transfercase

Got stuck in 4 low. The panel fuse kept blowing so I drove it to the house and didn't go over 40mph. I started hearing a whining sound coming from the transfer case. I put it in neutral tocoast down hill. All the sudden it acted like it was catching and gonna lock up but something gave and it wouldn't do anything no matter what gear it was in. Now when I have it running I can hear the sprocket turning. Only when its in gear. I try to push the buttons on the dash to shift outta 4 but the control lights go off and it don't come back on. When I wiggle the fuse for the transfer case the lights come back on then go off. It still sounds like the sprocket turns when I put it in gear.