My 1993 Jeep Chief Cherokee Limited, 4 Wheel drive has never worked properly since I bought the Jeep with 90K Miles. It was garage keep and probably never used for the 4 Wheel drive capabilities . I live in Chicago and we just got the big snow. I get the Jeep rolling and pull the heavy leaver to get it into " Part Time " 4 Wheel drive, and it seems to engage. After a few miles, the front right wheel acts as if it's flat. It's not flat, but it drives like it's flat and if I continue to drive it in 4 While drive , the steering Wheel get heavy and it's difficult to turn. What up with that ? Help.