I think that is what is going on. 2002 sportage 4dr with 80k automatic. 4w works but when im in 2H I can be going down the road and then its like I rode over a bump and a clunk noise up front. Had mechanic look at it, he mentioned the vaccum leaks with thise. He greased and cleaned some stuff. it worked for a day then day 2 it was randomly happening again a few times a day.. Vaccum leak? If I get the warn manual hubs installed will any warning lights show on dash? Those hubs seam pretty easy to install, is there anything different on the 2002 4dr that may cause issues when installing?