So when I got home tonight and was pulling in the garage, I noticed a very loud rattling/scraping sound coming from the front. I came to find out it only does it in reverse or drive and will only do it for about 20 seconds. I put it in drive and set the emergency brake and crawled under neath to see where it was coming from but I didn't have enough time to find it before it stopped. I also noticed it doing it at about 15 mph. Now, it does have the famous Hemi exhaust leak on the manifold. Does anybody think it could be the bolts rattling? Also it could be the transmission? It does some awfully weird things in overdrive. For instance, one time (and I mind you that the MDS was not on at the time) I was going up a hill and the rpm's kept jumping from 1500-2000... It also does that in town.