I have the '89 running pretty well at the moment. I got the 4WD to work the other day, but now have a new issue. When I turn left (and not every time) something starts banging on the underside of the floor pan. The noise is coming from under the center or passenger site of the Jeep. It seems to be rythmic rather than random banging, as if it's something on the drive train. I can't see any obvious issues underneath. I know that the exhaust has a broken mount next to the transmission, but when I slam the exhaust around by hand it doesn't make the same noise that I hear when turning left. Other than that, it drives fine. I actually drove it around for quite a bit and it didn't make the noise until I took a sharp left yesterday with a big passenger with me. Since then, I can get it to do it without anyone else in the Jeep, but just can not figure out exactly what is hitting underneath. Thoughts?