Hi, I'm new to the forum and have a mechanical question. I have a 2000 Jeep Wrangler, that I bought in 2007. I put a lot of miles on in and have not had many problems at all. About a month ago, I started to have a vibration that felt like it was under the driver's seat. It mostly happened when I was downshifting prior to stopping. Last week, a loud tattle started in the same area. I was driving down the highway in pouring rain. During the week it seemed to worsen and then by Thursday afternoon I was afraid to drive it. My son and father both took it for a test drive and thought it was the rear universal joints. Friday, my son removed the rear drive shaft and took it for a test drive and felt no vibrations at all. So he replaced both u-joints. When I drove it later, I still had the rattle, but the vibration was gone. I drove it about 50 miles down the interstate, running about 65 - 75 mph. When I exited off the interstate, it suddenly started an auful vibration and loud rattle. I drove slowly to my destination, about 5 miles. Now I'm wondering if it wasn't the U-joints after all. Or if driving it without the rear drive shaft caused the front u-joints to go bad. My dad thinks it could also be the bearings in the rear end. Any help or direction would be great. My late husband was my mechanic. Since he passed away, I've had to depend on my son and father to do my mechanic work.