I dont see any issue in using both, I have used both 3" spacer and 3.5" spindle on mine but mine is a 2wd so I dont have any torsion adjustments. I would say, try it and see what you can figure out. anything more than 3" added to the coils will seriously be pushing the boundaries of maybe, maybe not when it comes to alignment though. I know thats not much help, trying to be quick so i can go eat lol. If you have any more questions please feel free to ask!