I had a chance today to stare at a tj frame. I also have a chance to get a very clean southern tj frame for free. So my question is- Are the frames almost the same?? It looks like the tj frame lacks the very front shackle mount hole, and the very rear shackle mount hole, otherwise the look the same to me. Well besides the spring perches and shock mounts probably. Any info on this topic would be great! Thanks!