I have a thump type noise in my bronco when I drive slowly over rough terrain. I was looking underneath and found that if I push up on the area where the two ujoints go into the rear of the transfer case the whole section moves up and down. It appears that there is a bushing or something worn in the rear of the transfer case. There is also something in between the two ujoints that allows some play, I think it might be called a cardon joint or something. The actual ujoints don't seem to have play but whatever it is between the two is allowing some. I can't quite tell what is in between the two joints. Have any of you repaired the two ujoints with whatever is in between and whats the deal with the rear of the transfer case, do I need a new bushing or bearing and seal??