To upgrade the front you will need the following. The knuckles, rotors and calipers minimum. There is a few things I would suggest to make the upgrade work better, and probably required too. The tie rod, which is a major upgrade. Get an over the knuckle flip kit for it since it hangs down and get the drag link, also required. If you want to retain the 5X4.5 bolt pattern on your wheels, you will need a spacer ring to weld on the knuckles and reuse your wheel bearings. And then you will have to drill that pattern into the rotors. I don't have a write up on this right now, but will in the future since we have a WJ here we are parting out into a TJ and my XJ. But not sure when that upgrade will take place