The red line from the tc goes to manifold vacuum! If this is not hooked up to manifold vacuum your front axel won't lock but the tc will go into 4wd! We've stated this, please follow what we tell you to look at because most everybody here has been through something similar, that's why we respond to the questions. I'm fairly new to Jeeps but I've been working on my own cars for almost thirty years. We are trying to help you out but you have to be willing to listen.
1997 TJ, 5" IRO front with 4.5" HD IRO WJ rear, 35x12.5x15 Mickey Thompson MTZ, JKS disconnects