2001 jeep grand cherokee loud grinding noise and it resist's when i turn in

4 wheel drive part time? i dont drive on the dry road with it in part time i only drive it in part time when the roads are snowy or icey. the transfer case it full but the fluid it black and runny like water.
p.s. which 4 wheel drive should i use when driving on the snowy icey roads?
 
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