I am having some transfer case problems, it doesn't want to shift out of 4 high. I checked all the linkages and they were fine. Then I checked the oil level and couldn't feel any even about an inch and a half below the fill whole (damn the PO). I checked and filled the diffs and transmission but apparently I missed the transfer case. I have only driven it about 10 miles in the last 3 years due to the buildup and it has shifted fine until today. How bad do you think I messed the case up? is the shifting problem related to the lack of lube?