[JERKY420]

the best thing to do is take it to a shop and have them inspect it. There are soooo many bushing, joints and bearings to go bad in a 4WD it is hard to say the exact problem but a shop can look and show you the problem they usually know what to look for, they put it on a hoist to check it and unless you have a hoist in your garage you probably can't check it as well as someone in a shop.