Front wheels spinning

[zarmien]

OK so I've searched and I've pulled the codes and I can't find anything. When its wet My front wheels spin for like two full seconds before the knock when the AWD kicks in if it kicks in at all. It's probably the transfer clutches or what ever. My Q's are "Am I right?" "How hard is it to fix?" and "What are the part number I need to fix it?"

Thanks
Greg