Will, get some rear spring post extensions if you can. I don't know if the TJs are the same as ZJs but I'm pretty sure they are but there is post that comes down in the center of the coil from the top but it is not very long. Get a peice of pipe or something and ever weld it on or get RTV or similar and glue it on. When ever the coil becomes unseated, it will remain where is suppose to be because the post is still inside the coil. Plus, it doesn't have to be that strong because gravity is the only force acting on it. I can get a picture of what I am talking about if you want.