I have a 97 Wrangler 2.5l that does have a 4" suspension lift and 33" tires. I have been hearing a knocking noise that sounds like it is coming from the rear underneith. I thought it might be the spair tire in the back but it just doesn't sound like its coming from there. I took a look underneith and I dont see anything that looks loose or broke. It seems to happen everytime I shift gears. I dont know if it something that would happen to do with the lift or not thats why I mentioned it. If anyone has any ideas of what it is and how to fix it that would be great. Thanks.