if your looking to change to 5x4.5 your and use scarebird kit your going to have to change the hub, spindle; lower ball joint and I think upper; your in for quite abit of work
NO you do not need to change all that stuff.
unless you want to use only mopar parts to do the change over(but then you wouldn't need scarebird conversion) and would have used parts still! Why would he do that when all he has to do is redrill and tap the hubs on his 9" drums out to the 5 on 4.5 pattern and use 2 inch long 1/2-20 screw in studs. since the rotors ALREADY have a 5 on 4.5 bolt pattern. I have done it on a couple of cars already, not counting either of mine since they are not drivable yet. 1 of em (1 of the ones I did for someone else) has put over 10k (with V8 in it now) on the setup and he beats the heck out of it thinking it's a corner carver and that's using all the 9" drum parts. AND with the hub redrilled and using screw in studs all he has to do when it comes time to change the pads/rotors is buy em, no more redrilling rotors to 5 on 4.0. just slap em on ans back to business. I can say that you need a GOOD proportioning valve to make things work correctly(I used a stock 73+ one that works great but it's old) I have used the adjustable ones as well.
