i have a 2003 Liberty and cannot get into 2wd. i push the lever all the way forward and it shows 4w part time on the dash. When I shift to full time or 4w lo it grinds and makes terrible sounds. I cannot find anywhere if there is an adjustment to the lever. I can find a cable from the lever to the case but don't know how to adjust. Can someone tell me if there is an adjustment or what may be causing this problem?