Hello. I have a 91 XJ 2dr 4.0L 5spd 4X4. Today's been a beautiful day here in Vancouver, so i decided to just look around the jeep. Check the oil, tire pressure and whatnot. Anywho, back in winter (we didnt really have a winter), the 4x4 on the jeep was working fine. Anytime i put it in 4H, the...