JGCL has 186,000 miles...I engaged 4WD to drive off road in mountains, stopped and changed back to 2WD. I went about 15 miles and noticed a bad odor (I thought it was coming from outside...just a bad smell in the air). The Jeep was riding a little rougher than usual...or different. I thought that it may be bc I got 2 new tires put on the front the day before. I went about 10 more miles and came to a stop at a red light. At that time I noticed that smoke was billowing out of the L side from under the hood, it seemed). I turned L and I heard a popping noise plus the front seemed to jerk/jump when I turned...I was going to try to drive it back to the house, but after I parked it and then cranked it back up and drove it, the popping and jerking/jumping was a LOT worse. My brother drove it a little and advised that it is still in 4WD (even though I put it back in 2WD)...the lever is on 2WD...does anybody have any idea what's wrong? I need help QUICK...I am stuck in GA!!!