I've never had an automatic Jeep so I don't know if this is normal or not but heres what I've got. It's an 05 TJ Unlimited. When I shift into drive or from drive into reverse I get the strangest grinding noise I've ever heard a transmission make. When slowing I also hear the noise as the transmission downshifts. Some folks suggest this is normal for this transmission but I want to get more opinions. I wish I could demonstrated the noise but it gets lost in the translation. It's a combination of a grind and a roar.