Go to the spare tire thread for tips on getting a spare down when the secondary latch is messed up... also make sure you are not putting the entire jack tool together to crank the winch (i.e. don't add the last piece of the rod which fits the jack, or you will not be able to turn it right...)
http://chevyavalanchefanclub.com/cafcna/index.php/topic,114195.0.html