Today my 1997 TJ 2.5 was driving perfectly. Then as I backed out of a parking space I heard what sounded like a scraping noise. It went away so I thought I was hearing things. Drove to my next destination and went to leave an hour later. As I drove through the parking lot I decelerated at a stop sign. Suddenly the entire Jeep started shaking. Stopped her looked underneath and couldn't find anything wrong. Drove 20 miles towards home and had no issues. Stopped at one more place and it started doing ti again after I shut her down and started back up. It had a grinding sound and jumping on deceleration. WTF could this be? I have to drive the Jeep 3 hours one way and 3 hours back this weekend but am terrified to take her out because of this.